Jack-O-Lantern is a Rare Fortnite Contrail. Jack-O-Lantern was available via the Battle Pass during Season 6 and could be unlocked at Tier 54.
How-to Get the Jack-O-Lantern Contrail
Jack-O-Lantern is part of Season 6. If that season is still currently in the game, you can obtain this item by purchasing and/or leveling up your Battle Pass.