From Creatures Wikia
Clicking on the dispenser pops out quite a few of them and you will find they are labled as either food, fruit, seed or toy. Eating them makes your norns say funny things, and the toys are quite fun to play with. They also grow a plant, which makes more of them so it's a nice replenishing food/toy source. Another fun thing, on holidays(or by setting your computers time/date to a holiday, say St.Pattys Day on March 17th), the beans take on characteristics of that holiday. You'll just have to find out exactly what those fun specials are on your own though.