[Snail]

Possibly, though I always thought it weird that a potato shaped planet the size of Mars (Which cannot physically exist.. by the way)  would have a perfectly spherical moon (Which can exist, though likely would be somewhat irregular given its small size)

Maybe Kessel looks like a peanut because the Spice Spiders messed up the gravity by making so much spice or something like that.

[Flipside]

Maybe you could say that when it was still molten, it was a lot closer to the Maw, and so formed in a disorted shape and rotates on it's axis incredibly slowly for a planet of it's size?

The moon could have been created later by impact matter.

[Snail]

Maybe you could say that when it was still molten, it was a lot closer to the Maw, and so formed in a disorted shape and rotates on it's axis incredibly slowly for a planet of it's size?

[Flaser]

Further more thanks to the anisotropic gravity field that held its birth, its composition is anisotropic too - so in other words its distribution of mass is uneven.