When you installed FrameMaker, was there an option to install also the PDF creation add-on? (Possibly it is named differently.) I have FM 2019, but I cannot remember. Anyway, I would re-install FrameMaker and see whether this creates the Adobe PDF printer.
And when this does not help: Possibly you encountered a bug. Send an e-mail the FrameMaker support: email@example.com
Others in this forum had also reported that the Adobe PDF printer was not installed. The Adobe support team had helped.