
Jack Frost Is a character originally created by Thomas Nast, it depicting the titular character as a general freezing out the malaria that spread during the American Civil War. He also appears in the 1861's Harper's Weekly as a political cartoon.
In the Rankin Bass movies, he makes his debut in the 1976 special Frosty's Winter Wonderland, appears as a very minor character in 1979's Rudolph and Frosty's Christmas In July, and has last appeared in his own film, Jack Frost.

Jack Frost Seen In Frosty's Winter Wonderland 1976
In Frosty's Winter Wonderland. he was envious of how the children loved playing with Frosty the Snowman, and he thought that he could do better than Frosty. When Crystal was with Frosty, Jack Frost sends out a gust of icy wind, and it blows Frosty's hat off, seemingly killing him. That was, until Crystal brought Frosty back to life with a kiss, infuriating and bewildering Jack Frost, causing him to throw Frosty's hat back to the snowman, which made him madder.
He shows up not long before the snow-couples ceremony to cause a massive blizzard in a final attempt to get back at Frosty, which causes Crystal to notice him, remarking him as an important figure to winter. Her and Frosty offer to make him the best man, which he immediately accepts as "he's always been the best man", and he accompanies the wedding. He even makes winter last longer for the two so they and the whole town can enjoy the snow, until a pastor talks some sense into him about the other seasons being equally important. And being that Jack likes the spring "even if he's never seen it", he and the snow-couple take the train back to the North Pole.

Jack Frost Seen In Rudolph and Frosty's Christmas In July 1979
In Rudolph and Frosty's Christmas In July, he returns on top of Big Ben, supposedly doing his rounds in South America. Jack provides the magic Christmas wind needed to revive Frosty and his family, after which Santa and Mrs. Claus finally arrive.

Jack Frost In Jack Frost 1979 film
And in Jack Frost, he's a winter sprite who sends a wave of snow and low temperatures every winter, working above the January Junction at the snowflake factory with his two coworkers, Snip the snowflake maker and Holly the holiday snow gypsy Having fallen in love with a young maiden name Elisa after saving her from Kubla Kraus, he asks Father Winter to become human, which Father accepts, under the condition that Jack receives a house, a horse, a bag of gold, and a wife. Jack agrees and turns human, assuming the identity of Jack Snip. He runs a tailor shop in the town of January Junction with two friends who also turned human, Snip and Holly, who were sent by Father Winter to ensure Jack does not get into trouble. While he receives a house, a horse, and wealth after defeating Kubla Kraus, he fails to get Elisa's hand in marriage as she has fallen in love with a knight, Sir Raveneau, while Jack was away. He becomes a sprite once more, frosting Elisa's bouquet of roses as a farewell present as he returns to the sky above.