Hydraling

Source
Hydraling drops from Varasha's Egg inside a cave in the Writhing Mire, a fungal swamp in western Spires of Arak. Clicking the egg will initially cause Varasha to spawn. After killing her the Hydraling can be looted from the nest.

Pet Journal
The hydraling can be an expensive pet, as it is capable of eating from three food bowls at the same time.