How many fictional languages can you learn?

I know one is Klingon, you can learn that on Duolingo. That elf language in Lord of the Rings?

Can you speak Ewok? Jawa? or R2 droid? What about Chewbacca. I don’t know what that would be called. Fuzzballese? I am not sure. Shyriiwook, boring. Fuzzballese.