Batboy

Batboy is a superhero comic book series sold at The Android's Dungeon & Baseball Card Shop.

History
Batboy can be seen on a rack of comics when Bart and Milhouse are discussing the differences between  and Radiation Dude.

The cover shows a picture of a boy with a red cap holding a baseball bat surrounded by a green glow.

Behind the Laughter
The name is a likely reference to the term.