UrsprungDeverbal from gruffa.
Formergruff(indefinite, nominative, singular) · gruffs(genitive, indefinite, singular) · gruffet(definite, nominative, singular) · gruffets(definite, genitive, singular) · gruff(indefinite, nominative, plural) · gruffs(genitive, indefinite, plural) · gruffen(definite, nominative, plural) · gruffens(definite, genitive, plural)