Perfect rhymes (same vowel sound and ending consonant):
* These are hard to find! "Squirtle" is a unique word.
Near rhymes (similar vowel sounds but different ending consonants):
* Hurtle
* Whirtle
* Turtle (not exactly a rhyme, but close enough for a playful context)
Eye rhymes (words that look like they rhyme but don't actually sound alike):
* Circle
* Grateful
Rhymes in a specific context:
* If you're writing a poem about Pokemon, you might be able to use other Pokemon names that rhyme, like "Wartortle" or "Blastoise".
Ultimately, the best rhyme will depend on the context of your writing. Have fun with it!