Earlier quoted context omitted.
This seems to be just a marketing name. You could equally call plastic cups "polymer cups".
They are made from synthetic polymer such as biaxially oriented polypropylene (BOPP). If you go to a country where they use these, they call them polymer notes. They are made from a polymer and people that use them call them polymer notes. That's a decent amount of evidence compared to your no evidence. https://www.youtube.com/watch?v=pJTLCmIW1rA https://www.youtube.com/watch?v=7BD1xX7c1Jg https://www.youtube.com/res…
Polymer cups are also made from synthetic polymers like polypropylene. So are polymer knives and polymer forks.