Zaazoo of Final Boss on Dark Iron (US-H) sent in a screenshot of this interesting turtle corpse along the shores of the Swamp of Sorrows and suggested that the pagoda attached to its back could be of pandaran origin. Unfortunately for this line of speculation, giant turtle corpses have been all over the game since launch and are particularly prevalent in Darkshore. A night elf quest giver in Auberdine stated that turtle mounts were used by naga as battle carriages and supply transport. And then there's this unit from Warcraft II. It's a nice thought, though!