Moons can have moons, and they are called "moonmoons.
This was so funny to me I had to look it up (here's the wikipedia page)
A subsatellite, also known as a submoon, or a schmoon, is a "moon of a moon" or a hypothetical natural satellite that orbits the moon of a planet.
Terms used in scientific literature for subsatellites include "submoons" and "moon-moons". Colloquial terms that have been suggested include moonitos, moonettes, and moooons
A schmoon! Hahahahaha I love it. And the last one too, which was definitely coined by a sentient cow. "moooon"
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