'coarse grass' (Modern English fog)
Proposed ON Etymon (OIcel representative)
Other Scandinavian Reflexes
Norw fogg, fjagg, fjogg, fugg
Phonological and morphological markers
This is the earliest of only a few 15c. citations in OED and MED, all of which come from N or EM dial. The word is more widespread in MnE (see EDD, OED).
Occurrences in the Gersum Corpus