Pe​dophile sandwich ​pitch​man Jared Fogle, just three months into a 16-year prison sentence, has put on 30 cake-fueled pounds behind bars, according to a published report.

Fogle, ​whose claim he lost 200 pounds on a diet of Subway foot-longs led to his hiring as the sandwich company’s ​spokesman — until he confessed to having sex with teenage prostitutes — ​is reportedly stress-eating behind bars, where he is regularly taunted and threatened.

“He’s really started packing on the pounds again, probably from depression,” a prison insider told In Touch magazine, estimating that Jared has gained 30 pounds.

“Jared’s breakfast is usually Frosted Flakes with fruit or oatmeal with cake. He loves ‘cake day’ in the dining hall twice a week and he buys Honey Buns by the box, as well as other pastries in the commissary on his weekly shopping day. He’s been known to eat an entire box of eight at one sitting.”

He’s regularly taunted by fellow inmates at Colorado’s Federal Correctional Institution in Englewood​, where he’s called “Chomo​,​” short for child molester.

A recently released inmate from the Colorado lockup recalled an incident when Fogle was called a “dirty child rapist” and the sandwich man made the mistake of talking back.

“The inmate slapped him across the cheeks several times and made his face red. Jared just stood there stunned, then ran out of the gym,” the con recalled.

“He never ratted out the inmate who did it, though, because he was threatened that if he did, they would get him!”