Grenada
Its called the National Anthem, and will depend upon which country you are referring to.
Feijoada is the national dish of the country of Brazil.
Tamale is a dish native to Mesoamerica, not just one specific country.
Mexican Chicken, a national dish, is named after the Country name in the dish - Mexico! This has been called the "National Dish" of Mexico. This is often used as a spicy dish with chillies.
Brazil
A famous dish from the US is chicken fried steak
Norway
Grenada is the country where boil dung is found as its national dish
Smalahove is a Norwegian dish consisting of half a sheeps head.
Brazil
Poland has Bigos(Hunter's Stew) as a national dish.
If you mean pupusas (the correct spelling) then that is a Salvadoran dish.