Yes, DEFRAGFS, it is encouraged not to use it and you would have to find it on an older version of OS/2 as Arca Noae decided not to include it. JFS is pretty good about not fragmenting, it is a file system designed for Unix (AIX, Linux) and makes use of extends.
I can attach a copy if you really want to play with it, I forget why Arca Noae says not to use it. Also remember that SSD's don't need defragging like hard drives do.