Here's what rhymes with tarantulas.

Consider these alternatives

rattlesnakes / makes spiders / writers centipedes / needs snakes / makes millipedes / needs geckos / echoes porcupines / lines dragonflies / size hummingbirds / words roaches / motive armadillos / heroes crocodiles / miles mites / rights arboreal / territorial chameleons / variance squids / squibs