Skull Necklaces are items in The Legend of Zelda: The Wind Waker.
Skull Necklaces can be found in various chests as well as stolen and dropped by Moblins. They are stored in Link's Spoils Bag. Skull Necklaces can be given to Dampa and Maggie's Father for special rewards, such as Rupees. If you give three to Dampa, you can then play the pig-catching mini-game to win a purple Rupee if you catch each pig and bring it to Dampa. You can also sell them to Beedle for 5 Rupees each.