There are 3 tameable creatures with this look.
Exotic Family : You must be specced as a Beast Master of at least level 65 to tame and use Worms!
|Fox Grove, The Jade Forest|
|Remains larger than other caterpillars. He seems to vanish from Fox Grove at later quest phases, but can still be seen and aggroed from just outside Fox Grove if you stand right at the river's edge. Wait patiently and he'll pat down by the river.|
|The Jade Forest|
|May spawn from Widow's Webs.|