Perfect Rhymes:
* lucky
* fruity
* spooky
* cooky (informal)
Near Rhymes:
* ducky (without the "rubber")
* bucky
* tucky
* wacky
* crusty
Eye Rhymes:
* lucky (spelled differently but pronounced the same)
You can also find rhymes for "rubber" itself and combine those with a rhyme for "ducky":
Rhymes for "Rubber":
* blubber
* number
Combined Rhymes:
* blubber huckleberry
* number lucky
Let me know if you want to explore more rhyming options!