Fruit preserves are preparations of fruits, vegetables and sugar, often canned or sealed for long-term storage.
Many varieties of fruit preserves are made globally, including sweet fruit preserves, such as strawberry or apricot, as well as savoury preserves of vegetables, such as tomatoes or squash.
The ingredients used and how they are prepared determine the type of preserves; jams, jellies, and marmalades are all examples of different styles of fruit preserves that vary based upon the fruit used.
In English the world over the plural form “preserves” is used to describe all types of jams and jellies. (source)
So can hamsters eat jam at all?
No they can’t unfortunately. It is too sticky and sweet for them.