[Radek]

1. Juba Thobbers does identify himself. If you place the cursor over him, you get "Troll Juba" or "Juba Thobbers". I am not sure now what you get exactly. Troll Juba is an existing class in the game and Juba Thobbers belongs to it. But I am sure that Juba Thobbers identify himself.
2. I think Juba Thobbers is spawned in the woods between the clearing with the horse and the pier near the mill. There is a way through the woods from the horse to the pier. I am always following the way after getting the quest and I am always finding Juba Thobbers there.