Yes, but on mine, the motor will spin backward, but the teeth are welded on the disc, and the hub is tapered.
I could theoretically, remove the motor and reverse the mount and be able to dig fwd.
If I want to dig a trench, I drive backward.
You could however make up a hyd motor and disc that can be reversed.
You design what you want and a plasma/laser cutter will cut the holes for you, add digging teeth or stump grinder teeth and you are off and running.
Dig fwd or rev by turning the blade around and reverseing the hyd motor with a motor spool valve.
On the size hyd motor, I would guess about 4 or 5 cu in, giving an rpm of 601 to 751 rpm.
My PTO pump puts out about 13 GPM