Trogg

Troggs were a race of extradimenonal creatures and the main antagonists in the animated film, Gnome Alone.

Biology
Troggs are extremely chaotic mischievous monsters, they're rather small with purple skin, red eyes, rounded body shape like a ball, with a mouth filled of teeth and they also had retractable limbs. Troggs would pretty much consume everything in sight, indicating that they have an insatiable hunger. These creatures would be able to instantly travel to Earth from their own dimension through portals, while Troggs mostly spend time in their homeworld sleeping in large groups. They could even combine themselves into one enormous, colossal subspecies.

Weaknesses
Though Troggs could not be killed, the gnomes used a nectar from a flower which would immediately send them back to their own dimension but not for long, however.