Smorgasbord borrows Swedish smörgåsbord, combining smörgås, open sandwich, and bord, table.
The deeper original butter-clump reading is qualified as presumed in Merriam-Webster. Smörgåsbord is also an English spelling variant.
Source
Collins: smorgasbordThe British entry supports the two components; the Webster’s New World and Random House entries explicitly list smörgåsbord as an English variant.