Yes, you can trade vinylmations, but to be honest the quality of it has diminished the past year or so. DS enjoyed trading vinylmations but the past year especially the trading has been bad and we actually didn't do any trades last trip. They have gotten very strict with the rules and there aren't as many locations as before. And most importantly there really aren't any good vinylmations to get in a trade. Many people trade in the non-popular, clearance sale vinylmations you get at
Disney store or the really UGLY ones from Urban Series. When you try to do a trade you find you usually have the same choices or tend to get the same ones in the mystery trade and there aren't any good ones you want to trade for.
Unfortunately I don't think it's worth lugging around vinylmations in the parks anymore to trade.