I have been a tradesman for 20 years and never heard someone refer to Teflon tape as plumber's tape. It is always called Teflon tape or thread tape regardless of whether or not it actually contains Teflon. If someone asks for plumber's tape, metal strapping with holes is what is being discussed.
With that being said, I have seen the occasional new kid return from a trip to the truck with Teflon tape when asked for plumbers tape. Always fun to watch.