They can and not just with one another, Morgoth was able to breed especially degenerate Men with his orcs to produce half-orcs/'goblin-men' in the First Age and Saruman did it again (using Dunlendings for the human half) in the Third Age. They served as elite troops & spies, IIRC one reported on the Hobbits' movements at Bree.
They can and not just with one another, Morgoth was able to breed especially degenerate Men with his orcs to produce half-orcs/'goblin-men' in the First Age and Saruman did it again (using Dunlendings for the human half) in the Third Age. They served as elite troops & spies, IIRC one reported on the Hobbits' movements at Bree.