Stone Heads

From Zelda Wiki.org

These are like boulders, but are in the shape of heads and are almost impossible to lift by yourself. What you need is the Power Bracelets which are found in Fire Mountain, once you have them, you can lift up these rocks. There are only three of these located on the Great Sea. One on Stone Watcher Island, one on Outset Island which is blocking the entrance to the Savage Labyrinth, and the last one is at Headstone Island blocking the entrance to the Earth Temple.