These type of worms are small and light green, with darker green stripes running across their bodies. They look similar to their king, but much smaller. They may or may not be able to talk. Their appearance and movement resemble that of inchworms only with bigger round heads.
- With the exception of the worms in "Evicted!" who invaded Finn's home, most worms appear to live in or around Tree Trunks' home, possibly due to the presence of apples, which the worms can eat and live in.
- These worms are not to be confused with Shelby, an earthworm-like creature who lives in Jake's viola.
- One worm appears in the Adventure Time Ending Theme.
- Worms seem to be intelligent, due to the fact that the only educational place seen in Ooo (besides the Library) was worm college, seen in "The Real You."
- There were also worms eating the bark of the tree in "Up a Tree."
- The Worms are eaten by Finn and Jake in "Food Chain" and are refered to as caterpillars.
- The Worms are enemies in Break the Worm.