Pouncer

Pouncers are Thwomp-like creatures in the game Wario Land: Super Mario Land 3. They look and behave almost exactly like Thwomps, except they can move horizontally and have no spikes on their tops. Wario can hop up on them to cross gaps.

If a Pouncer lands on an enemy, it will turn into a 10 Gold Coin for Wario to collect. However, would Wario touch a Pouncer's spikes, Wario would immediately be defeated and lose a life (instead of turning into Tiny Wario).