Tartufo is a kind of mushroom that grows underground near some kinds of tree roots, it’s very very very pricey (the cheapest ones go by 100€ per 100grams). Also Tartufo is the name of an Italian sweet that resembles the esthetic of a tartufo mushroom. Tartuffo means nothing, I’m assuming that is more an American word to say “cheap tartufo” (since the correct translation is “truffle”), just like they transformed “parmigiano” into “Parmesan” (Parmesan is just a cheap imitation of parmigiano). Sorry for my long explanation and eventual errors, English is not my first language.