Puf
From Kerbal Space Program Wiki
Puf is a small planet that has been nicknamed the "Eyeball Planet". Judging by pictures of this little space rock, it looks to be close to the size of Duna in KSP 1.
Surface
Most of Puf's surface is covered by brownish rock with the poles having major ice caps. However, Puf is mostly known for the huge crater/lake on its surface. It's unknown why it has this giant ocean but one theory is that a proto planet collided with Puf resulting in a giant crater.
Atmosphere
Puf has a thin, blue atmosphere similar to Earth.
Moons
As of February 14th, 2023, there are no confirmed moons.