Ptyon rhymes with:
absecon, acetosyringone, alteon, bergeron, calgon, crampon, decathlon, delaune, devaughn, doggone, einon, haton, incheon, inchon, jumbotron, kirwan, lieson, malathion, mouton, papon, recon, rubicon, savion, savon, scaleatron, sephlon, styron, suon, teason
Ptyon sounds like:
padden, paden, paduano, patane, pathan, patin, patina, patino, patman, paton, patten, pattin, patton, payton, peaden, peden, pedone, peedin, pepitone, petain, petino, petition, pettine, petunia, peyton, photon, pipitone, pitino, pitman, pitney, pittman, podany, podium, poten, potion, ptomaine, put-on, putdown, putman, putnam, putney, puttnam, python