Kronkus Mod will give you 4 kinds of moon, all this kind also bring many mystery things, your mission is merge the contents of the GameData folder into the GameData folder found in the directory of your KSP install.
This mod adds:
Kronkus: Huge purple ringed gas giant orbiting between Dres and Jool
Sketti: Closest Kronkian moon. Resembles a ball of noodles.
Meelo: The middle moon. Orbits the outside of the the rings of Kronkus. It’s monotone colors are home to the most “sensible” moon in the Kronkus system.
Kersex: It’s the “Almost Kerbin” home away from home. Much fun to be had here!
Eahpeh: The pecular ice moon of Kersex.