Togerobo

Togerobo (棘ロボ), known in English as Rolling Head, is an enemy from the Game Boy Advance game Wario Land 4. They are robot enemies with spikes at the front of its body and all over its head. If Wario approaches one, it will drop its head in front of itself and it will roll along the ground, possibly hitting Wario. The only way to defeat Togerobos is to charge at them from the back or stomp on them on the top when their heads have fallen off. Togerobos only appear in the level The Curious Factory. The name "Togerobo" is a portmanteau of "toge", which means "thorn" in Japanese, and "robo", which is a prefix that derives from "robot".