frogs rfogs forgs ofrgs rofgs orfgs frgos rfgos fgros gfros rgfos grfos fogrs ofgrs fgors gfors ogfrs gofrs rogfs orgfs rgofs grofs ogrfs gorfs frosg rfosg forsg ofrsg rofsg orfsg frsog rfsog fsrog sfrog rsfog srfog fosrg ofsrg fsorg sforg osfrg sofrg rosfg orsfg rsofg srofg osrfg sorfg frgso rfgso fgrso gfrso rgfso grfso frsgo rfsgo fsrgo sfrgo rsfgo srfgo fgsro gfsro fsgro sfgro gsfro sgfro rgsfo grsfo rsgfo srgfo gsrfo sgrfo fogsr ofgsr fgosr gfosr ogfsr gofsr fosgr ofsgr fsogr sfogr osfgr sofgr fgsor gfsor fsgor sfgor gsfor sgfor ogsfr gosfr osgfr sogfr gsofr sgofr rogsf orgsf rgosf grosf ogrsf gorsf rosgf orsgf rsogf srogf osrgf sorgf rgsof grsof rsgof srgof gsrof sgrof ogsrf gosrf osgrf sogrf gsorf sgorf
Note: these 'words' (valid or invalid) are all the permutations of the word frogs. These words are obtained by scrambling the letters in frogs.