Jell-O is a registered trademark of Kraft Foods for varieties of gelatin desserts, including fruit gels, puddings and no-bake cream pies.
Jell-O is sold prepared (ready to eat) or in powder form, and is available in various colors and flavors.
The powder contains powdered gelatin and flavorings, including sugar or artificial sweeteners.
It is dissolved in hot water, then chilled and allowed to set.
Fruit, vegetables, and whipped cream can be added to make elaborate snacks that can be molded into shapes.
Jell-O must be put in a refrigerator until served, and once set, it can be eaten. (source)
So can hamsters eat jello?
They can in small amounts but do bear in mind that it is very sweet and so just a little bit will be okay.