Flash Gordon and Prince Barin fight for their lives in "the two terrible tests", to avoid being executed for treason by Ming the Merciless. In the second test, Flash has to fight three snarling tigrons, barehanded. He snaps the first tigron's neck. The two remaining beasts, starving, fight over the carcass, leaving them both wounded and broken. 
The tigron of the comic strip has a large green horn growing from its head.
The tigron of the serials doesn't have a horn; it looks just like an Earth tiger.