Stumpkin

Stumpkins are a strange species of carnivorous plant-animal hybrids native to the planet Nexus. Resembling ambulatory stumps with carved, frightening faces, stumpkins grow in the ground and are able to uproot themselves to walk around searching for food.

Diet
Stumpkins have been known to attack nearly anything that will fit into the gaping mouths. Fortunately for the settlers of Nexus, they are not very intelligent. A stumpkin might even, for example, swallow an active grenade should one be tossed into its open maw.