Billy The Piglet

Billy The Piglet is a pig who appears in Angry Birds POP! as a wanted pig.

Angry Birds POP!
In the game, he appears as a wanted pig who the player must catch. He can hide in levels. To capture him, complete the level successfully. After he has been captured, you'll receive your reward, and you can then proceed to find and capture the next pig. In case you fail or quit the level instead, he will escape to another level, and you can then try to capture it again once you reach that level.

Trivia
He is the only Wanted Pig to not be an already existing pig but with a different name.