Anything related to these movies (or the Teenage Mutant Ninja Turtles flick that opens in August) is expected to sell well this summer. The surprise here is the longevity of Frozen, which debuted last winter and has yet to see a thaw in popularity. “Disney really did not foresee the response to this movie” and didn’t produce enough Frozen toys to meet demand, says Toy Castle owner Brian Mack. That’s made it tough for locally owned stores to get their hands on Frozen merchandise other than coloring books, sticker albums and the like. “Anything related to that movie is selling out as soon as we get it,” Mack says.