Was going to say something similar. Wit bolletje translates to white little ball, so not far from roll.

We also call them zachte bolletjes or soft little balls. Or just zacht broodje which means soft little bread. As opposed to harde broodjes (hard little breads) which I guess refer to keizerbroodjes (little emperor breads (the bread being little, not the emperor)) which are emperor rolls.

My family is from Limburg, Netherlands, but we may also have been a bit weird. This is just Dutch, by the way, not Limburgish.