Neon’s A Doll A Day… Again (2020)

[fishy]

Odango (dango is a rice dumpling) buns are actually any asian-style twin buns, they don't have to be covered. As far as I know, there isn't a special name for covered buns or the covers themselves, they're just bun covers, and the hairstyle is always called the same, covers or not.

Then I will call them odango bun hat thingies

It's also called the "ox-horn hairstyle" in China, iirc. But odango is what Sailor Moon's are called, which popularized it.