For a number of years I have used a short boom pole, about 30 cm long, that pins to the top link point of my trailer mover that goes on the 3 pt. Used to lift the end of a log only, then another chain onto the draw bar to pull the log with. Believe me you do not want to be doing a wheelie while skidding a log. I have carefully skidded logs that weighed more than my tractor with this simple system.
In my "good ideas to remember" sketch book I have been working on a sort of wheeled bunk. This to strap under the trailing end of a log with two or four small wheels on it, then lift the front end with the 3pt. I have seen where people are using essentially two log arches, one on each end to move logs with an atv.
The links to the posts of the arch, trailer, frame in post #9 are ingenious. I can also imagine a frame to attach to the wheeled frame with hay bale spears, some what like what is used on a 3pt, to move large round bales with an atv. Or even pallet forks to move a pallet of small bales or fire wood for instance. This idea will definitely go into my sketch book.