What to Know about ‘Unfrosted’ and the Real History of Pop-Tarts

First, there was the Flamin’ Hot Cheetos biopic (complete with an Oscar-nominated song). Then came “Tetris”; “Air,” about Nike Air Jordan sneakers; “BlackBerry”; and “Barbie.” It is, in other words, a golden age for product-origin-story movies. The latest is “Unfrosted: The Pop-Tarts Story,” a satirical history that Jerry Seinfeld has expanded from his stand-up act.…

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