"Good things from the garden
Garden in the valley
Valley of the Jolly ('ho, ho, ho') Green Giant!"
The big guy is Thrym, a Flesh Titan in Zul'Drak, and as far as I know the biggest beastie in WoW thus far. Think twice when he tells you to Eat Your Vegetables.
(No Noggenfogger was abused when taking this screenshot. He is that big).