Simplify the following text for a Grade 7 native English-speaking person.
Original: He is best known for his voice-work on Avatar : The Last Airbender , Codename : Kids Next Door , Phineas and Ferb , Adventure Time with Finn and Jake , American Dad !
Simplified: He is best known for his voice-work on Phineas and Ferb , SpongeBob SquarePants , Adventure Time with Finn and Jake , American Dad !