These are the stronger variants of the Sproing-Oing from Super Paper Mario which appear more later in the game than the regular Sproing-Oings. They are the Boing-Oing, Zoing-Oing, and Dark Sproing-Oing. Their mini counterparts that they split into when they are attacked but not defeated are also included.
For the sprite for the regular Sproing-Oing and Mini-Sproing, see the original project by
@Twin138956Scratch.