Worms

Worms are creatures in Adventure Time. They first appear in the episode "Tree Trunks," where they make a brief cameo in an attempt to eat an Apple. In the episode "The Enchiridion!," there are worms in the trees as Finn and Jake were riding the giant dollar. The Worms also appear in the show's closing credits. They are later seen in "Evicted!." A worm first appears on Finn's bed, and makes some kind of siren-like noise, which went somewhat like "Wowowowo." Finn threw The Enchiridion at the worm to knock it off saying "No worms on the bed!" Later, when the boys are given their house back from Marceline, they find it is infested by many Worms, including the Giant Worm King. It seems that when they are seen by someone they give off the siren, possibly to signal or call the Giant Worm King. They may also have their king's ability to hypnotize others (at least) into hugging them.

Pupil Worm appear in the episode "The Real You" which shows some resemblance to the regular worms.

Appearance
These types of worms are small and light green, with green stripes running down their body. They look similar to their king except much smaller. They may not be able to talk, and don't have a small crown on the side of their head. Their appearance and movement resemble that of inchworms only with bigger round heads.

Trivia

 * Outside the worms who invaded Finn's home in "Evicted!," most worms appear to live in or around Tree Trunks' home, possibly due to the presence of apples she uses for her pies 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 that the only place seen in Adventure Time where you learn (besides the Library) was worm college seen in The Real You.