Yes and no! They can't produce true purrs due to the flexibility of their hyoid bones (the bone that vibrates when small cats purr) but they do produce a similar sound when feeling content
https://youtu.be/LFr9n-WwWlU
Yes, that is true. Though, leopards actually can't roar as loud as lions and tigers. Also, I would love to have one of these series with a jaguar, but also, one with accurate patterning on it. They are my favorite big cat, and get overlooked and often mistaken as leopards, and that just sucks. Sorry, lol.
Leopard can't actually purr. No big cats can purr, except for cheetahs. Cheetahs also chirp to each other, and if you haven't heard it, you should, cause it's adorable.