 they were named thus because the camels raise their heads when they come to the water due to its extreme coldness and the camels that raise their heads are the ones that do. bishr bin abi khazim said mentioning the ship 
وسميا بذلك لأن الابل ترفع فيهما رؤوسها عند الماء لشدة برده والابل القماح، التى ترفع رؤوسها. قال بشر بن ابى خازم يذكر سفينة 