I live in LA and grew up in Florida. Mountain lion is almost exclusively said out here. Back in Florida, it seemed like a mix between cougar and mountain lion,

I live in LA and grew up in Florida. Mountain lion is almost exclusively said out here. Back in Florida, it seemed like a mix between cougar and mountain lion, with some people saying puma. I think I've only heard an Appalachian Mountain hipster use the term catamount in conversation. I think there's a college sports team whose nickname is the catamounts.