Apparently according to Wiki, there is a Tiger Shark spawn and 2 x driftwood spawns at Boss Cooper spot. (Shadow Reef dungeon)
He's the boss to the right of the temple along a path, easily missed.
I have killed him 3 times but he apparently does not always appear. (Normal mode not story)
Nevertheless, I have never seen a Tiger Shark or any drfitwood spawns there whether he is there or not, so I assume Wiki is wrong.