fromage derives (through metathesis, form -> from) from (!) late Latin formaticum
Funny, same phenomenon in french caribbean Creole language, where they tend to say froumi for fourmi (ant). Which shows that languages are like water, they are lazy and follow in their course the path of lesser resistance and effort.
Lazy ? wait, not all of them. In a remote french province, Auvergne as they call it, an industrious tribe has resisted fromage for centuries and keeps, somewhat stubbornly, on making FOURME, like fourme d'Ambert, a cylinder shaped blue cheese.