It's easy to find them if you look for them by day. At night, they become undead goblins. You can find scouts around Tepoks mine in the NW of the Black Mountains South (10642,5869).
Be sure to look for them in daylight. Be careful, because they can jump you. Look from afar which one is the scout, make contact and run away. He will follow (alone, hopefully ;). When you're far away from the others, fight him and kill.