[latentsea]

There are thousands at least. I recall seeing an entire dictionary of them once in the library at my university.

To this day I still discover new ones that constantly amaze me someone was able to put a sound to it. I think my favorite to date is probably mozomozo. My wife used it to describe a baby flailing it's arms around. I was like ok... What do you mean? She repeated the action of flailing the arms around. I laughed. Oh the Japanese.