Franklin Dexter "Frank" Pearl is Judy's "pest" friend who ate paste once for a dare, so Judy often calls him Frank-Eats-Paste-Pearl. In Judy Moody: Around the World in 8 1/2 Days, he was called Earl the Pearl for the My-Name-Is-A-Poem Club. In Judy Moody and the NOT Bummer Summer, (same as the movie), he has an older sister named Maddy.
- In Judy Moody, Judy see Frank in third grade and passes her an invitation to come to his birthday party, which is in three weeks.
- In Judy Moody Gets Famous!, Frank tells Judy that Jessica Finch has won the NV (Northern Virginia) spelling test, becomes the queen bee of it and is in the newspaper, which makes Judy jealous. Later in the book, Frank hurts his pinkie by someone stepping on him, and has to go to the hospital with it.
- In Judy Moody Saves the World!, Frank shows Judy his stamp collection.
- In Judy Moody Declares Independence, Judy, Rocky, Frank and Stink has a Boston tub party in the bathroom, throwing tea bags into the bath, until Dad comes in and grounds Judy by telling her no more friends over for one week, and tells her and Stink to clean up the bathroom before Mum gets back.
- In Judy Moody: Around the World in 8 1/2 Days, Amy Namey sits in between Rocky and Frank interviewing them at lunchtime. Later, he is called Earl the Pearl for the My-Name-Is-A-Poem Club.
- In Judy Moody and the NOT Bummer Summer (same as the movie), Judy and Frank attempt to find Mr Todd without Rocky and Amy, but fail every time to make things worse and not get thrill points.
- Judy Moody - Frank's friend who calls him Frank-Eats-Paste-Pearl.
- Rocky Zang - Judy and Frank's best friend.
- Stink Moody - Judy's little brother who is a member of the TP Club.
- Amy Namey - Judy's classmate who sits next to Rocky and Frank at lunchtime in Judy Moody: Around the World In 8 1/2 Days.
- Jessica Finch - Judy's classmate and sometimes enemy. She, Rocky and Frank trick Judy into thinking that the class guinea pig, Peanut, has babies in Judy Moody: The Doctor Is In!.