Frosty was the head thug who used to work for Mr. Freeze. During that time, he worked alongside the Hockey Thugs and Ms. B. Haven. Disguised in his warm suit, Frosty listened to Freeze who told him about his plan to freeze Gotham City and hold it for ransom unless the city bowed to his demands, Gotham would be winter forever and that they had no choice to bring the billions that he needed to complete his research so that he could find a cure for his wife.
Later in the Snowy Cones Ice Cream Factory, Frosty attempted to inform his boss about Bruce Wayne donating some diamonds which might be of use to Freeze's plan. As he tried to hold up the front page newspaper article, he was hit the Freeze Gun and frozen solid. Fries was irritated at the disruption while watching home movies of his wedding day. It seems he made no attempt to unfreeze Frosty within the next ten minutes, even after noticing the article he was trying to show him.