They are big, fat, and pink, with light yellow eyes, big mouths, curly tails, and small ears.
Role in series
Old Man Jenkins owns a group of worm hogs that he keeps in a pen. They appear when Jenkins asks SpongeBob and Patrick to feed his worms as their second chore on his farm. SpongeBob gives them some slop, which Patrick eats as well. Patrick kicks a small worm hog away from the food, so SpongeBob feeds some slop to it. It is very hungry and almost swallows him whole, but it eventually spits him and his clothes out.