Attempting to mount /dev/fd0 won't work, because if the OS has a special device for floppies, it's not named that. /dev/fd is something else entirely. There's probably no floppy device at all - they're treated like any USB removable-media drive. A little Googling suggests that you're right, and non- …

The filesystem type is msdos in OS X. (There ought to be a mount_msdos in /sbin. However, OS X should automatically mount DOS floppies. It sounds as if it isn't recognizing your drive. It has generic USB floppy support, but check the manufacturer's website for drivers. I assume you've already tried …