Unfortunately No hamster cannot eat fudge at all. The reason being is that fudge is far too sweet for them to eat and can cause an array of health issues and therefore should be completely avoided altogether.
In addition to just the fudge itself there are sometime other ingredients added such as nuts, fruits, candies and other flavors.
Some of these other ingredients are also bad for hamsters to eat. Such as the candies that are added as they contain a lot of sugar as well.
These ingredients result in a really high sugar-to-water ratio that is extremely bad for hamsters.
This can cause hamsters to experience diabetes, obesity and other health related issues.
Therefore make sure to avoid trying to feed fudge to your hamster.