Can male ferrets share a cage?

In most cases, yes they can - two of our male ferrets, Reuben and Ya'akob, have been happily sharing a cage for some time and other than the completely normal and short-lived squabbles that all ferret owners become used to, they get along perfectly well. Do remember that for the few hours each day when they're not asleep, ferrets are extremely active and as such require a large cage with plenty of space. if you're keeping two ferrets in one cage, it needs to be a very big cage. Unlike most animals, ferrets never fight over food which makes it far easier to house two together.

Having said that, ferrets are highly intelligent creatures and as a result also highly individual, so if my ferrets - and indeed, all the other ferrets in the world - do something, it doesn't necessarily mean that your ferrets will do the same. Some ferrets actually prefer to be alone and some dislike all other ferrets, though the vast majority prefer ferrety company. Try putting them in the cage together and see what happens - there may be some fighting to begin with, but unless they're drawing blood let them settle. Chances are they'll be curled up together fast asleep before too long.