Kramer said:
Are there any supernatural creatures that humans tell stories about? Or are they all just legends?
In my experience, yes or for whatever reason spiritual entities have decided to represent themselves as such. Perhaps they're thoughtforms, sometimes it's hard to tell the difference. Your question is vague, typically when you ask vague questions the answer addresses a wider relevancy, for example the fact that Demons might be considered a "supernatural creature people told stories about". I immediately thought of examples like "skin walkers" and vampires, if you have any further doubt of them existing just take a look at Joe Biden and Bill Gates.