From the Super Mario Wiki
Clumphs are a primitive species of enemies with rat-like facial features. They are dressed in caveman garb. These beings dwell in the outskirts of the Beanbean Kingdom, atop Joke's End. They are highly territorial, and attack any intruders with their massive clubs on sight. They have three different attacks; the first attack consists of smashing the ground with their club, triggering a quick yellow shockwave that deals small damage. The second "attack" is a burp that charges up for the third technique, which is actually a variant of the first one: a slow purple shockwave appears, dealing severe damage if not avoided. Before unleashing the third technique, a part of the Clumph's body will flash yellow, and the flashing part will determine the purple shockwave's size. If the head flashes, the shockwave will be medium-sized; if the body flashes, the shockwave will be small; if the feet flash, the shockwave will be very big.
Although Clumphs are not weak against the Firebrand technique, they may run away from battle if its hair (or wig) is set on fire. Nonetheless, a Clumph is a very powerful opponent, and usually fights until the end.
Clumphs only appear in Mario & Luigi: Superstar Saga, and they only appear in battle, never in the overworld. The only way to face one is to engage another foe in combat first.
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