AFAIK, “Teflon:” without modifiers is just PTFE. Non-PTFE “Teflon” and filled TEflons have extra letters after the name, like TEFLON-AF or TEFLON-FEP.
I don’t know how crystalline PCTFE is. As I say, how transpasr5ent it is depends upon its processing. It could be that the transparent stuff is highly crystalline.
Here’s duPont literature for Teflon perfluoroalkoxy resin (PFA), no PTFE at all. The trademark is for a line of fluropolymers. Yes, they also sell filled PTFE under that trademark, too.