Skeleton Piranhas (real name Bago Bago) are common enemies that appear in the stage Super Mabobo.
They originate from Zelda 2
In the game
They appear after Karnov's defeat and in the boss battles for Jaws and the Big Daddy. They can be eaten, but not be defeated. The skeleton Piranhas are both colored black and red. The red variety is purely a skin change and does not spit fireballs like in its original game.