Phantom Hourglass Golden Frogs
The Phantom Hourglass Golden Frogs are located throughout the Great Sea. While you can find the Golden Frogs while sailing about, you cannot do anything with them until you have first acquired the Cyclone Slate, which is acquired from Golden Chief Cylos at the Uncharted Island. After this point, Link can shoot the Golden Frogs found on throughout the World of the Ocean King. They will then show Link a symbol and at any point there after, Link can draw that symbol on the Cyclone Slate, allowing him to warp to that part of the Sea.