We don't have synonyms for gammelost yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are grammelot.
(n) :
Alternative form of gamalost. [A traditional Norwegian cheese made by souring skimmed cow's milk with a lactic starter, slowly heating it and separating the curds, and introducing mold, then allowing it to ripen.]
(n) :
Alternative form of gamalost. [A traditional Norwegian cheese made by souring skimmed cow's milk with a lactic starter, slowly heating it and separating the curds, and introducing mold, then allowing it to ripen.]