I have been killing alot of goblins for faction lately. I was surprised when this guy popped as I had not seen him in the 1000s of deaths (for goblins)carnage.
He was in a hut in the Goblin Fort in Warsliks at 3102.55, -87.62, -17.92 which is different than a loc given below. In all likliehood he is like the Grachnist and spawns in multiple locations... just very rarely it would seem.