I don't know if NDIS is in GhostBSD as standard, but I doubt it. Never having had to use it myself, I can only point you to info.
Mounting a Linux partition from BSD can be tricky as not all Linux filesystems are supported. Basically the syntax is the same :-
mount <drive> -t <filesystem> <mount-point>
Only ext2fs is mountable from BSD normally, but you my be lucky if you use the read-only option (-o ro).
If you want to transfer data between the systems, using a FAT formatted pendrive works best for me.
Linux user between 1999 - 2014; now a BSD user.