After you have done the oasis seed thing at parchment desert go to coldfeet glacier talk to margret she will tell you she needs fossil chip 2 ignore her and dig, you will find a white creature it will run away after that go to richmond and he will say you have found a creature named oonga oonga find it again and go talk to richmond he will give you a oonga oonga mask after that go put on the mask and search for him again this time he gives you red boned fossils you can do that as many times as you want but you can only find him one per visit to coldfeet glacier. ps. for the second time you find him you'll need snowberries which you can find at the guild shop