Yes there is many mods like that. You R a newbie.
It depends whether or not you have the german expanion as to which ones. for instance if you don't have it than you will only be able to use ships like the playable iowa or north carolina BBs. If you do have the expansion than you can enjoy the yamato an the bismarck. You will need the JSGME mod enabler for most of these. check out the threads below.
http://www.subsim.com/radioroom/showthread.php?t=139915
http://www.subsim.com/radioroom/showthread.php?t=139776