Here's what rhymes with cockatoo.
to do two too due du dew tu chew deux adieu ado bu ju jus peu pu boo chou chu doo tue pooh poo who you new true knew blue drew u blew coup qu shoe zu anew canoe lieu shew su sue undue vous fu lu rue stew taboo undo zoo brew hu ku loo mu nu pew seu shu sou tattoo vu woo yew yu coo cou ewe feu gu ru shou thu tzu vou wou wu goo moo shoo bugaboo gnu roux kazoo thew whew into through few view grew que crew pursue threw flew q avenue bamboo clue cue glue hue queue accrue cu flue slew subdue untrue flu overdue piu thru beaucoup eschew fue hew mieux outdo shampoo shrew sprue vnto vue clew mew overdo redo strew spew zebu peekaboo slue buckaroo phew wazoo booboo achoo atishoo hitherto residue screw renew debut ensue caribou construe jusqu skew kangaroo askew imbue outgrew halloo honeydew valuer endue fondue indue marabou overshoe overdrew regrew review revenue overview withdrew retinue overthrew revue sinew ballyhoo hullabaloo foreknew bestrew muumuu overflew prevue overgrew interview rendezvous superglue barbecue misconstrue barbeque