Hello,
If I understand your issue correctly, you currently have Cash on Delivery (COD) enabled in Magento 1.9, but you also want to have an additional Cash on Delivery "Check" option, as this is an important distinction when you're arranging for delivery with your delivery vendor.
IF there's an offline payment method that you do not have enabled (ie. Bank Transfer Payment or Check/Money Order), then you can proceed within your Magento Admin to System--> Configuration --> Sales --> Payment Methods , enable one of these other offline payment methods, and simply adjust the title to "Cash on Delivery - Check". Shoppers will only see the title that you've provided.
Viel Glück!