Troll Molar
Troll Molars are used in some alchemy recipes, such as Juggler and Quick-Grow. The only way to get these is to go to Winterhorn Ridge and defeat trolls, the heaving white yeti monsters.
Tip: Use a Lucky Mix and equip a Luck Stone and attack the trolls using piercing attack (square + down button). This increases the chance to get chest drops, but even then, they are pretty rare.