I like this idea. I bet if you rub wax on it will slide great. Seriously, rub wax on the side that you are going to be jibbing. If there are a bunch of them, I think there is no limit to how creative you could get with them. Please post fridge jib footy.
When i used to snowboard, i saw an article in transworld, some guy had a settup in his backyard with fridges for boxes, so im guessing they legit work. Try for sure! and get some pics up!