Can roly-poly be used in a sentence?
Yes, and it would be normally.
The question's category by-line suggests "roly-poly" is an American colloquialism for the woodlouse, in which case, a sentence like, "There is a roly-poly ambling across the floor".
In the UK, roly-poly is a somewhat archaic adjective for being overweight as a person or animal, and also the name of a pudding. So, perhaps, "You'll end up roly-poly if you eat too much roly-poly pudding!"
"How is sentence used in a sentence?" is an excellent way to use the word sentence in a sentence. You could also try, "I used the word sentence twice in a sentence in which I asked how to use the word sentence in a sentence." You used the adverb wrong in the sentence. Correct any misspelled words in your sentence.