Jonny Belt Creator, Executive Producer Robert Scull Creator, Executive Producer Jacob Bertrand Gil (Speaking) Voice Teddy Walsh Gil (Singing) Voice Bailey Gambertoglio Molly (Speaking) Voice Brianna Gentilella Molly (Singing) Voice Tori Feinstein Oona Voice Tino Insana Mr. Grouper (Speaking) Voice Chris Phillips Mr. Grouper (Singing) Voice Jet Jurgensmeyer Nonny Voice Grace Kaufman Deema Voice Mia Vavassuer Little Fish Voice Marleik "Mar Mar" Walker Goby Voice Catherine Ashmore Bradley Actor Caleb Clark Actor Leah Janvier Actor AJ Kane Actor Nirvaan Pal Actor Fred Tatasciore Actor Eric Walker Actor Janice Burgess Co-Executive Producer