I use mango butter on my hair as a hair mask once or twice a week. It seems to soften my hair and prevent split ends. It's a bit difficult to remove in the shower though, I have to rinse my hair a lot.
I've never thought about eating mango butter but that sounds like a great idea. I've eaten cookies made with cocoa butter before and they were very good. I bet baked goods made with mango butter would be delicious too.