Do the kids go to preschool? If so, they probably already know all about Frozen even without seeing the movie. I know that my DD4's entire class has been Frozen-bonkers since it came out, even those who hadn't seen it. The ones who have seen it talk about it constantly (even still), they reenact scenes, and sing all the songs. They bring in Frozen books on book day and Frozen toys on share day. They go crazy when a classmate gets a new Frozen t-shirt or lunchbox. We've attended 3 different Frozen themed birthday parties, and they even sang a parody version of Let It Go at pre-k graduation. Last week they had a class costume party. There were three Elsas and two Annas in the class. Assuming they haven't been living under a rock, they probably already know Frozen.