Naval Bud is a young species of a Piranha Plant which appears in the Yoshi series. It is associated with its mother, Naval Piranha. It's simply a vine of Naval Piranha in its bud stage with its vines bearing thorns.
Naval Bud first appears in Super Mario World 2: Yoshi's Island.
In the game, this foe tries to attack Blue Yoshi by stretching itself to Blue Yoshi in order for attacking him with its spiky thorns. Aside that, these foes cannot be defeated unless their mother, Naval Piranha, is defeated.
Two Naval Buds reappear in Tetris Attack.