I have seen JSONP. But I'm not a frontend dev and in my experience the web suffers from a persistent overspecialization of terms. I didn't mention the term JSONP, because I didn't want to end up calling something JSONP just to have someone point out, that this isn't really JSONP, but floobleworp, which is when you use jQuery and add the comment-symbols to make it safe against XSS or something in that regard.
Also, I still consider JSONP an incredibly gross idea :)
Also, I still consider JSONP an incredibly gross idea :)