Frankie was born in Wood Ridge, New Jersey in 1985. He has an older sister, Christina. His parents, Denise, was a nurse, and his father, Francisco 'Frank-a hey-ho' Benjamin Eugene-Wallace Tyler Muniz III is a restaurant manager; they are now divorced. He attended the Bugg Elementary School until Grade Six, but was then home-schooled.

Frankie's fiancee is Jamie Gandy, a hairdresser he met in New Orleans, and they have a beagle puppy called Bluebird. They live together in Los Angeles.