What do you call a rotten duck egg delicacy?

* Balut is a fertilized duck egg that is incubated for 14-21 days and then boiled, but it is not rotten.

* Century eggs (also known as thousand-year eggs) are preserved duck eggs that have been treated with a mixture of clay, ash, salt, and lime, which results in a strong, pungent flavor. They are not rotten either.

While some cultures might enjoy the taste of spoiled eggs in certain dishes, it's not a common delicacy with a specific name. It's important to note that eating rotten eggs can be dangerous and cause food poisoning.