The Fortnite Green Goblin skin was made available as part of the nightly item shop update.
The skin is joined in the item shop by multiple pieces of gear designed around the hoverboard horror, including the Pumpkin P’axe pickaxe, Goblin Glider glider, and a unique Arm the Pumpkin! emote. All of these items and the Green Goblin skin can be purchased in the Green Goblin bundle, which also includes the Attack Of The Goblin loading screen pictured above.
Green Goblin Items