Zooknock is the 10th squad mage who is involved in two quests. He can be found on Ape Atoll at the end of the Ape Atoll Dungeon. He makes enchanted bars with a M'amulet mould and monkey denture. He also makes monkey greegrees with a monkey talisman and the remains of a monkey (bones or corpse). After you selected the second option to make a new greegree, than right click the bone and use it on him. Do the same with the talisman as he will not accept them in your inventory.
Skeleton ape bones cannot be made into a greegree.
Greegrees are considered hard to get, as the player needs to get to the end of a long, dangerous tunnel, with lots of level 100+s. There are also poisonous spike traps. This tunnel does contain monkeys that drop the bones needed for some of the greegrees.