Wormmouths are bipedal reptiles native to Hammerfell. They are related to guar, alits, and kagouti. These vermin have a maggot-shaped body propelled on two legs, and have a beaked mouth that is almost as large as the rest of their bodies, making them resemble a mouth on legs. Sharp teeth line the inside of their mouths, and their backs are lined in plates of armored scales. Due to Hammerfell's arid environment, wormmouths get their fluids from the plants and animals they eat, but they are also known to prey on people. Their tongues are sometimes harvested for alchemical purposes. Wormmouths appear to range in height from the size of a large rat to as tall as an alit.
Though they typically dwell in the arid regions of Hammerfell, the Nubbed Wormmouth is known to dwell in the mountains located along the cold border between Skyrim and Hammerfell. Although native to Hammerfell, Wormmouths were also known to inhabit Vvardenfell during the Second Era.