From the Super Mario Wiki
The title of this article is official, but it comes from a non-English source. If an official name from an English source is found, the article should be moved to its appropriate title.
Biroron are jack-in-the-box enemies encountered in the Mario Zone of Super Mario Land 2: 6 Golden Coins. Biroron appear from certain blocks along with a single coin. After it is released, it bounces around wildly. To defeat a Biroron, Mario has to jump on its head or shoot a fireball at it.
Names in other languages
|From 「ビローン」 birōn, onomatopoeia for sticking one's tongue out.