Francis Albert "Frankie" Stecchino (aka Frankie the Enforcer) is a very large and strong kid at John Adams High. Harley Keiner, the local bully, took advantage of his strength to turn him into his head flunky, alongside Joey the Rat. When Harley got sent to reform school, Frankie revealed his gentle side and became friends with Cory and Shawn.
His father is the professional wrestler Vader, and Frankie originally wished to live his father's footsteps and be a Sumo wrestler, but he later chose instead to become a poet.
His mother, known only as "Mrs. Stecchino" appears once in New Friends and Old. She's never seen or mentioned again. In fact, even in her only episode, Feeny is the only one that speaks of or to her.
Seems to return to his criminal ways after reappearing with Joey in Graduation. However, this could just be a non-canon joke for old time's sake as this episode marks the final appearances of both Frankie and Joey.
He sings also in the local church choir. According to Joey, he sings like an angel.
In Rave On, Topanga calls Frankie a "mallrat". Ethan Suplee was in the movie Mallrats.