Technically speaking, there are three separate types of monsters called 'a Crushbone pawn'
One is found in Valley of the Great Swarm ( -375, 24, -56 ) Copy/waypoint -375, 24, -56 - lvl 7-8, agro but not social.
One is found south of Orc Hill, in the camp and by the ramp leading down off the hill. ( 186, 61, -204 ) Copy/waypoint 186, 61, -204 - lvl 8, agro & social
One runs randomly underneath Kelethin, around its outskirts - lvl 9-10
Possible classes for all types are Assassin and Guardian