Not exactly - it's "type". There's several different programs that handle different types of file systems, and the type argument lets mount pick the right one.
As for "msdosfs", you're close enough. Microsoft DOS was usually known as "MS-DOS", so "the MS DOS filesystem" -> "msdosfs" ... I think. It's otherwise known as FAT. I'm not sure why FreeBSD uses the name it does; I'm sure there's some reason.
As for "msdosfs", you're close enough. Microsoft DOS was usually known as "MS-DOS", so "the MS DOS filesystem" -> "msdosfs" ... I think. It's otherwise known as FAT. I'm not sure why FreeBSD uses the name it does; I'm sure there's some reason.