Cheerleaders are NPCs next to the Gnome Ball minigame. Although they have a talk to option they are in a sealed area which is not accessible and therefore cannot be talked to. Their only purpose is to tell players when they have scored a goal (they will shout Goal! and dance around) in the minigame. When players have won they will do a similar dance and shout "You Win!".
They are also seen in Death's party after completing the 2015 Hallowe'en event.