"One candy, two candies"
Translation:Jeden cukierek, dwa cukierki
Yes, it is Nominative singular, and also I'd say that it's among those foods that are usually treated as grammatically animate, for example for "Do you want a candy?" I'd only say "Chcesz cukierka?" and not "Chcesz cukierek?", although technically the latter should be the correct variant.