Frankie is the son of Denise and Paul Kevin Jonas Sr. and the younger brother of Kevin Jonas, Joe Jonas and Nick Jonas. Jonas is sometimes referred to as the "Bonus Jonas" and ''Biff''.[1] He is of Italian (from a maternal great-grandfather), German, Cherokee, English, Irish, Scottish, and French-Canadian descent.
In 2009, Jonas voice acted in Hayao Miyazaki's animated film Ponyo, released in American theaters on August 14, 2009. He played Sōsuke, a character who is befriended by a juvenile fish