I’m still relatively new, I have no idea what a moss stitch is, lol. The spots are formed by switching colour after every stitch on even rounds and using only black on odd rounds. It sounds annoying, but once you get used to holding the two yarns at once it’s surprisingly easy. You just grab the other colour every time you have to pull through both loops on the hook.

It wasn’t actually as hard as it looks. The colour changes were definitely intimidating at first, but surprisingly manageable. The pattern is by June Gilbank and is for sale on her site, Etsy or Ravelry