MJPetersen said:
In the future, I think that I will be very careful when backing the scoop into an area which may contain huge rocks.
Well for sure you know where the weak link is.

I seriously think that you can straighten it out sufficiently with a large cresent/pipe wrench and a piece of pipe for an extension. The trick will be to hold the scoop securely while applying the necessary pressure. Maybe hook it up to the 3pt in drag mode and block the lift arms down.
Or use the power of your tractor to pull the handle of the cresent attached to the vertical part of the twisted angle iron.
Or (more control) use a cable come-a-long attached to the cresent and an imovable object (tree?).
Or separate the scoop from the frame and stand each part on its tail and massage it with a hammer. You will need some blocks and such, but I am sure that you can get it pretty straight.
Just remember that once it has bent it will bend the second time even more easily.
You should be able to get the twist out. Best of success!!
Mike in Warsaw