Definitions for "Jack Frost"
a personification of frost or winter weather
Jack Frost is an elfish creature who personifies crisp, cold, winter weather; a variant of Father Winter (AKA Old Man Winter). He is a figure some believe to have originated in Viking folklore.
Jack Frost was a Christmas film released during the winter of 1998, starring Michael Keaton and Kelly Preston about a father that dies and comes back as a snowman.