Here's what rhymes with koopa.
pupa stupa Words that almost rhyme with koopa
outta scuba tuba doodah barracuda una supra oeuvre tuna ua hua summa tua hula puma duenna chukka sutra lacuna pukka louvre macula helluva bazooka beluga vicuna fistula scrofula satsuma appaloosa manoeuvre hallelujah incunabula outmanoeuvre