Doug is a trader who is located at the entrance to the Bandit Camp. He will sell unlimited supply of arrows and other hunting supplies. When you talk to him for the first time he will give you a map of the Bandit camp and warn you about the dangers of the swamp.
He will not bear a grudge if you attack and defeat him. He is worth 80 experience and will drop a Tell joke scroll, short bow, some arrows and some gold.
At the entrance to the Bandit Camp, on the bridge next to the campfire at the south side of the swamp.