Is there a Danish word for sandwich? that isn't the borrowing from English? like in Swedish, Smörgås (meaning something like: lump of butter)
As far as I can tell, the very word Sandwich is the name of a person credited with inventing the dish. It's not a term that specifies what the object is with idioms. Likewise with the term Hamburger/burger
Norwegian nouns belong to three noun classes: masculine, feminine and neuter. Adjectives and determiners agree in gender with the noun they modifiy. Riksmål and conservative Bokmål traditionally have two genders like Danish, but Nynorsk and most speakers of Norwegian regional dialects use three genders to different extents.
There is no way in general to infer what gender a specific noun has, but there some patterns of nouns where the gender can be inferred. For instance, all nouns ending in -nadwill be masculine in both Bokmål and Nynorsk (for instance the noun jobbsøknad, which means job application). Most nouns ending in -ing will be feminine, like the noun forventning(expectation).