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Yelps is the goblin who appears to play as part of the Squeal of Fortune. He is only seen within the minigame itself and can't be spoken to.
His role appears to be to advertising the game to players, via the popup window. During the game he is fired across the screen when the player presses the button to stop the wheel.
As of an update on 2 April 2012 titled Squeal of Fortune - Extra Spins, he sells spins and issues out spin tickets for the Squeal of Fortune.