Although I'm sure it is a mistake "Chattering Bonewalker" in Dreadspire Keep has the raid tag when you /con it signifying a 5 minute downtime for resting. Easily killed by a group but annoying nonetheless.
It may be a mistake on the programmers' side, but this named mob spawns in the Demiplane of Blood as well. We had him as an add when we fought the Swirling Bloodspirit in there. Dropped the same hammer he drops in Dreadspire.