Bugge proposed that the -toskr element is a reformation of the Old English word tūsc (Old Frisian tusk) and, in turn, that the element Rata- represents Old English ræt ("rat").
West Frisian language | North Frisian language | Old Frisian | East Frisian Low Saxon | West Frisian Islands | Saterland Frisian language | Frisian languages | Frisian Islands | West Frisian | East Frisian (''Ostfriesisch'') |
Other courses of study have included Old, Middle, and Early Modern English, Old and Middle High German, Old Norse (Old Icelandic), Gothic, Old Frisian, Old Saxon, Middle Dutch, history of the English, German, Dutch, and Scandinavian languages, Latin and Greek philology, Latin paleography, and Middle English paleography.