Well, kush bashi is "bird head". karakol is police station in Turkey too. But I guess Ariel meant the shape of the pommel by "eagle head", not a translation. I have been describing it as "like a goat's foot" to someone who doesnt know the name of the model, but eagle head seems good too
It is very interesting that German-Austrian museums have great samples of karabelas from Turk-German wars, but there are uncomparably less or none in Turkish museums, even Military Museum doesnt have a good collection of them. This is perhaps because it was really soldiers' item, and even just infantries'. Not noble cavalries', with their broad and medium long structures. They never had gold or jewel decorations, and never used by princes, pashas.. So they were accepted inferior, not important enough to save and take care of?