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