Frank Rossitano is a character played by Judah Friedlander on 30 Rock. After Liz Lemon, head writer and the protagonist of the series, Frank is the most prominently featured writer of the show-within-a-show.
The character always appears wearing a trucker hat with a humorous phrase written on it, which is Friedlander's routine trademark in real life, and large thick-lensed glasses. He lives with his mother and his rent money goes directly to her.
Frank seems to be rather childish, lazy and libidinous.
Liz: What do guys like?
Liz: No, I mean if you were to go on a date with a girl, how would you want her to act?
Frank: Like she was in a porn.
Tracy: So, how you doing over there, Theo Huxtable.
Toofer: I'm doing good.
Tracy: Nah-uh. Superman does good; you're doing well. You need to study your grammar, son.
Frank: [to Toofer] Wow, that was embarrassing for you.