Becoming Like Frosty

Only one of the kids returned, ever, but Frosty always did. Although we never saw Frosty the kids did. They would always be a bit extra when Frosty was back. Several kids have gone missing each year, from all over the world whenever Frosty is here.
There has only ever been one child to have been ever reported to have been brought back by Frosty, ten years later that is. She hadn't looked to have aged a single day since the last time she was last seen.