froing rfoing foring ofring rofing orfing friong rfiong firong ifrong rifong irfong foirng ofirng fiorng iforng oifrng iofrng roifng orifng riofng irofng oirfng iorfng fronig rfonig fornig ofrnig rofnig orfnig frnoig rfnoig fnroig nfroig rnfoig nrfoig fonrig ofnrig fnorig nforig onfrig nofrig ronfig ornfig rnofig nrofig onrfig norfig frinog rfinog firnog ifrnog rifnog irfnog frniog rfniog fnriog nfriog rnfiog nrfiog finrog ifnrog fnirog nfirog infrog nifrog rinfog irnfog rnifog nrifog inrfog nirfog foinrg ofinrg fionrg ifonrg oifnrg iofnrg fonirg ofnirg fnoirg nfoirg onfirg nofirg finorg ifnorg fniorg nfiorg inforg niforg oinfrg ionfrg onifrg noifrg inofrg niofrg roinfg orinfg rionfg ironfg oirnfg iornfg ronifg ornifg rnoifg nroifg onrifg norifg rinofg irnofg rniofg nriofg inrofg nirofg oinrfg ionrfg onirfg noirfg inorfg niorfg froign rfoign forign ofrign rofign orfign friogn rfiogn firogn ifrogn rifogn irfogn foirgn ofirgn fiorgn iforgn oifrgn iofrgn roifgn orifgn riofgn irofgn oirfgn iorfgn frogin rfogin forgin ofrgin rofgin orfgin frgoin rfgoin fgroin gfroin rgfoin grfoin fogrin ofgrin fgorin gforin ogfrin gofrin rogfin orgfin rgofin grofin ogrfin gorfin frigon rfigon firgon ifrgon rifgon irfgon frgion rfgion fgrion gfrion rgfion grfion figron ifgron fgiron gfiron igfron gifron rigfon irgfon rgifon grifon igrfon girfon foigrn ofigrn fiogrn ifogrn oifgrn iofgrn fogirn ofgirn fgoirn gfoirn ogfirn gofirn figorn ifgorn fgiorn gfiorn igforn giforn oigfrn iogfrn ogifrn goifrn igofrn giofrn roigfn origfn riogfn irogfn oirgfn iorgfn rogifn orgifn rgoifn groifn ogrifn gorifn rigofn irgofn rgiofn griofn igrofn girofn oigrfn iogrfn ogirfn goirfn igorfn giorfn frongi rfongi forngi ofrngi rofngi orfngi frnogi rfnogi fnrogi nfrogi rnfogi nrfogi fonrgi ofnrgi fnorgi nforgi onfrgi nofrgi ronfgi ornfgi rnofgi nrofgi onrfgi norfgi frogni rfogni forgni ofrgni rofgni orfgni frgoni rfgoni fgroni gfroni rgfoni grfoni fogrni ofgrni fgorni gforni ogfrni gofrni rogfni orgfni rgofni grofni ogrfni gorfni frngoi rfngoi fnrgoi nfrgoi rnfgoi nrfgoi frgnoi rfgnoi fgrnoi gfrnoi rgfnoi grfnoi fngroi nfgroi fgnroi gfnroi ngfroi gnfroi rngfoi nrgfoi rgnfoi grnfoi ngrfoi gnrfoi fongri ofngri fnogri nfogri onfgri nofgri fognri ofgnri fgonri gfonri ogfnri gofnri fngori nfgori fgnori gfnori ngfori gnfori ongfri nogfri ognfri gonfri ngofri gnofri rongfi orngfi rnogfi nrogfi onrgfi norgfi rognfi orgnfi rgonfi gronfi ogrnfi gornfi rngofi nrgofi rgnofi grnofi ngrofi gnrofi ongrfi nogrfi ognrfi gonrfi ngorfi gnorfi fringo rfingo firngo ifrngo rifngo irfngo frnigo rfnigo fnrigo nfrigo rnfigo nrfigo finrgo ifnrgo fnirgo nfirgo infrgo nifrgo rinfgo irnfgo rnifgo nrifgo inrfgo nirfgo frigno rfigno firgno ifrgno rifgno irfgno frgino rfgino fgrino gfrino rgfino grfino figrno ifgrno fgirno gfirno igfrno gifrno rigfno irgfno rgifno grifno igrfno girfno frngio rfngio fnrgio nfrgio rnfgio nrfgio frgnio rfgnio fgrnio gfrnio rgfnio grfnio fngrio nfgrio fgnrio gfnrio ngfrio gnfrio rngfio nrgfio rgnfio grnfio ngrfio gnrfio fingro ifngro fnigro nfigro infgro nifgro fignro ifgnro fginro gfinro igfnro gifnro fngiro nfgiro fgniro gfniro ngfiro gnfiro ingfro nigfro ignfro ginfro ngifro gnifro ringfo irngfo rnigfo nrigfo inrgfo nirgfo rignfo irgnfo rginfo grinfo igrnfo girnfo rngifo nrgifo rgnifo grnifo ngrifo gnrifo ingrfo nigrfo ignrfo ginrfo ngirfo gnirfo foingr ofingr fiongr ifongr oifngr iofngr fonigr ofnigr fnoigr nfoigr onfigr nofigr finogr ifnogr fniogr nfiogr infogr nifogr oinfgr ionfgr onifgr noifgr inofgr niofgr foignr ofignr fiognr ifognr oifgnr iofgnr foginr ofginr fgoinr gfoinr ogfinr gofinr figonr ifgonr fgionr gfionr igfonr gifonr oigfnr iogfnr ogifnr goifnr igofnr giofnr fongir ofngir fnogir nfogir onfgir nofgir fognir ofgnir fgonir gfonir ogfnir gofnir fngoir nfgoir fgnoir gfnoir ngfoir gnfoir ongfir nogfir ognfir gonfir ngofir gnofir fingor ifngor fnigor nfigor infgor nifgor fignor ifgnor fginor gfinor igfnor gifnor fngior nfgior fgnior gfnior ngfior gnfior ingfor nigfor ignfor ginfor ngifor gnifor oingfr iongfr onigfr noigfr inogfr niogfr oignfr iognfr oginfr goinfr igonfr gionfr ongifr nogifr ognifr gonifr ngoifr gnoifr ingofr nigofr ignofr ginofr ngiofr gniofr roingf oringf riongf irongf oirngf iorngf ronigf ornigf rnoigf nroigf onrigf norigf rinogf irnogf rniogf nriogf inrogf nirogf oinrgf ionrgf onirgf noirgf inorgf niorgf roignf orignf riognf irognf oirgnf iorgnf roginf orginf rgoinf groinf ogrinf gorinf rigonf irgonf rgionf grionf igronf gironf oigrnf iogrnf ogirnf goirnf igornf giornf rongif orngif rnogif nrogif onrgif norgif rognif orgnif rgonif gronif ogrnif gornif rngoif nrgoif rgnoif grnoif ngroif gnroif ongrif nogrif ognrif gonrif ngorif gnorif ringof irngof rnigof nrigof inrgof nirgof rignof irgnof rginof grinof igrnof girnof rngiof nrgiof rgniof grniof ngriof gnriof ingrof nigrof ignrof ginrof ngirof gnirof oingrf iongrf onigrf noigrf inogrf niogrf oignrf iognrf oginrf goinrf igonrf gionrf ongirf nogirf ognirf gonirf ngoirf gnoirf ingorf nigorf ignorf ginorf ngiorf gniorf
Note: these 'words' (valid or invalid) are all the permutations of the word froing. These words are obtained by scrambling the letters in froing.