>>534754774
There isn't.
There are lunarians, which are reskinned villagers with ad-astra related trades. There are two structures that I know of, one a tower, another an underground "complex" (it's not an en extensive one, just a couple halls and a couple rooms).
There is desh, cheese, and ice shards. These are just ores found underground, no points of interest on the surface like an ice cap.
GC had "evolved" vanilla mobs as hostile spawns at night, ad astra just has the occasional corrupted lunarian.
That's everything I've encountered on the moon. Maybe I haven't seen everything but I'm doubtful there's more.