A Creeper Egg is a block in the shape of an egg that is found only in the Mars Dungeons, in the boss room. These eggs contains Baby Evolved Creepers which hatch if TNT shot by an Evolved Creeper Boss hits it or if a Creeper (normal or evolved) explodes near by.
They cannot be picked or mined except using the Sticky Desh Pickaxe.
The Creeper Egg shares the same model from vanilla Dragon Egg but with a green tint.
The egg may be obtained in the same way as the Dragon Egg; if you under mine the egg such that it falls on a torch.