The fourth Jonas and the one who we least care about. He will probably replace Kevin Jonas in a matter of years. He probably has jealously problems and will more than likely murder his brothers in a fit of jealousy.
Fangirl: OH my God! Did you hear Frankie Jonas is getting his own television show?
Fangirl 2: Why the hell would I care about stupid Frankie Jonas? He's the least likable, and the least attractive.