Toupin rhymes with:
jupin, trupin, arpin, aspin, backspin, coppin, crespin, crispin, daspin, flippin, galpin, gilpin, halpin, hennepin, jospin, juarez-espin, jupin, lapin, ongpin, pepin, peppin, pippin, protropin, ruxpin, somatotropin, steppin', tappin, tippin, toppin, trupin, turpin, vipin
Toupin sounds like:
t-bone, tabone, tappan, tappen, tappin, taubman, tavano, tebben, theophania, tiffany, tiffin, tippen, tippin, toben, tobin, toibin, toivonen, toobin, topham, toppin, towbin, tubman, tufano, typhoon