What are the Djinn from Clash of the Titans (2010) based on?

I was watching Clash of the Titans (2010) and I really liked the Djinn, I thought the idea of bark skinned desert sorcerers was really cool and wanted to read more about it. I know Djinn is usually another name for Genies or spirits from Arabic myth but that isn’t anything like what we see in the movie, I thought that perhaps they were based on something else but just took the name from the Djinn but I can’t find anything.

Are they actually based on anything from Mythology or just fabricated for the film?