Trap Door

Quote from The Legend of Zelda: The Minish Cap Door Mimic figurine: "Appears in the Royal Valley & Dark Hyrule Castle. They look like doors, but they're really traps! If you get too close to one, it will fall down on you."

Trivia

 * A unnamed enemy that is similar to the Door Mimic appears in Ocarina of Time in the Fire Temple and the Gerudo Training Ground. If Link tries to open it, it will wobble then fall on him. It can be destroyed using Bombs or the Megaton Hammer.