Choplin rhymes with:
coplin, joplin, koplin, kopplin, poplin, aplin, applin, caplin, champlin, coplin, eplin, esplin, joplin, kaplin, kemplin, koplin, kopplin, pamplin, poplin, striplin, tamplin, taplin, templin
Choplin sounds like:
cableone, caplan, caplin, cephalon, chaplain, chaplan, chaplin, cipollone, civilian, cofflin, copelan, copelin, coplan, coplen, coplin, coppolino, couvillion, couvillon