Mars has two moons, Phobos and Deimos. Here's a breakdown of their shapes:

* Phobos: Phobos is irregularly shaped and resembles a potato. It's actually quite elongated, with its longest dimension being about 27 kilometers.

* Deimos: Deimos is even more irregularly shaped than Phobos and is more like a lumpy, elongated sphere. It's about 15 kilometers in its longest dimension.

Both moons are likely captured asteroids, which explains their irregular shapes.