Near rhymes (similar sounds, but not exact):
* Bungle: This is the closest you'll get in terms of sound.
* Wrangle: Similar vowel sound and similar ending consonant.
* Mingle: Again, similar vowel sound.
* Sungle: A playful, made-up word with the same sound.
Eye rhymes (spelled similarly, but different sounds):
* Congle: This is a made-up word, but visually similar.
Other options:
* Fangle: This is a somewhat archaic word, meaning a new or odd thing, which could work in some contexts.
It's important to note that rhyming "dongle" perfectly is difficult, so consider the context and tone you're trying to achieve.