it has been around 25 years since i was an active apostate (jw) talking with ex-mormons. so i don't remember the slang terms mormons used for themselves. but an example of jw slang is "the truth" to refer to the religion (how long has he been in the truth?) when talking to other jws casually. i definitely remember that mormons had their own version, just not the specifics. and i also remember threads where we would laugh with one another while comparing them.
Canada