Gilriss the Handler will only accept two Tuskers at a time. Go back to the beach area and capture the third Tusker. You'll be able to speak to Gilri ...
Killed him earlier today with...
65th cleric
65th warrior
62nd rogue
59th rogue
56th druid
51st druid (me)
Bolgin Codslayer has a 12hr spawn timer who is the NPC you turn in the "Froglok Essence" which is looted from Ulump in Swamp of No Hope.
After handing Bolgin the Froglok E