Dumb jock? Think again. The four-time Super Bowl champion has turned his larger-than-life personality into a winning brand that earns him an estimated $10 million a year—and he’s only getting bigger.

Rob Gronkowski first retired from the NFL in 2019 as a member of the New England Patriots. The future Hall of Fame tight end retired again in 2022 as a member of the Tampa Bay Buccaneers. And even ...