- “Okay, it’s me! I can't help it! I just like squealing! It makes me feel big!”
- ―Frankie the Squealer
Frankie is known, as his name suggests, for his indiscretion. He can't help squealing because it makes him feel big. His squealing was so uncontrollable that he even managed to rat himself out occasionally.
It is implied that he often ends up tortured specifically to shut him up for his indiscretion: While being beaten by Legs and Louie in an attempt to get him to shut up, he tells them Fat Tony's real name is Marion, so they resume the beating. The Springfield Mafia, incompetent as they are, continue to retain Frankie's services, even as he continues to be attacked, kidnapped, and poorly treated for his apparent continuing problem with keeping secrets.
Despite this, however, his uncontrollable urge to commit indiscretion has also aided the mafia as well, as he informed Legs and Louie of Homer Simpson as the culprit behind the shootings at the mafia summit while pursuing him with guns. He is also similar to the other mafia member, Jimmy the Snitch.
Frankie wears a blue-green suit, a purple button up shirt, and has gold jewelry around his neck, and short brown hair. In his debut episode, "Insane Clown Poppy", he, like Johnny, had a darker shade of yellow skin, then afterwards, starting in Season 16, his skin color is a normal yellow coloration instead.
In "The Fat Blue Line", he and the other members of the mafia originally had Johnny Tightlips as his boss instead after the latter temporally betrayed Fit-Fat Tony by framing him for the wallet pickpocketing, but after Fit-Fat Tony cleared his name and exposed Johnny as the real pickpocket with the police's help after he forced Frankie to squeal on Johnny in front of him and the mafia so the police can hear it on Fit-Fat Tony's hidden wire, Frankie then eventually reaccepted Fit-Fat Tony as his boss again along with the other members of the mafia.
In another one of his cameo appearances in "Diary Queen", Frankie shouted to his fellow mafia members that he isn't dead after they dumped his body in a river, resulting Johnny to pull his gun out and shoot at Frankie when Frankie attempted to swim away after shouting to the mafia members.
- Episode – "Insane Clown Poppy" (Debut)
- THOH – "Treehouse of Horror XIV"
- Episode – "The Seven-Beer Snitch"
- Episode – "Homer's Paternity Coot"
- Episode – "Ice Cream of Margie (with the Light Blue Hair)"
- Episode – "Rednecks and Broomsticks"
- Episode – "Donnie Fatso"
- Episode – "The Real Housewives of Fat Tony"
- THOH – "Treehouse of Horror XXIII"
- Episode – "Penny-Wiseguys"
- Episode – "Bart's New Friend"
- Episode – "Dogtown"
- Episode – "Flanders' Ladder"
- Episode – "I'm Just a Girl Who Can't Say D'oh"
- Episode – "The Fat Blue Line"
- Episode – "Diary Queen"
- Episode – "A Made Maggie"
- – The Simpsons Movie
|Don Vittorio DiMaggio | Fit Fat Tony | Louie | Legs | Joey | Johnny Tightlips | Michael D'Amico | Frankie the Squealer | Jimmy the Snitch | Joey the Arsonist|
|Former Mafia Members|
|Fat Tony (deceased) | Bart Simpson | Homer Simpson | Nicky Bluepants Altosaxophony|
|Joe Quimby | Snake Jailbird | Krusty the Clown | Luigi Risotto | Marge Simpson|