Answer: Spoiler alert: Frosty dies. He is viciously murdered by an evil magician named Professor Hinkle, who wants Frosty's magical top hat so badly that he traps him and his friend Karen in a greenhouse while she tries to get warm from the cold. A discarded magic top hat brings to life the snowman that a group of children made, until a magician, professor Hinkle, wants it back, and the temperature starts to rise. Frosty will melt or no longer be a jolly soul, if the kids cannot get him away from Hinkle and warm weather, so he hops a train to the North Pole with young Karen.
Hope this helps....... Stay safe and have a Merry Christmas!!!!!! :D