Rumble Grumble is a member of the Speedtrux.
Rumble Grumble is a ankylodump from Split's gang. He doesn't talk popularly just muttering . Rumble Grumble and Split have the same spoiler.
Abilities: Like other ankylodumps, Rumble Grumble can use his bed to launch objects at other opponents.
He also appears at the Ankylodump Games.