The other day I was at Target and I saw two sets of pins, a set themed around Mickey Mouse and a Set themed around Minnie Mouse in the new Mickey section of the store. If I were to buy these pins, could I trade them in the parks? Thanks.
Generally speaking, yes. As long as the pin is hard metal enamel, and looks suitably "Disney", it's good to trade.
If it's plastic, obviously non-Disney ( Bugs Bunny, or a generic American Flag, for example) or appears blatantly counterfeit, you might have a cast member that objects to the trade, but it's rare to run into a cast member that can tell whether a pin is from Disney or not and even less common to find one that actually cares.
Two things they've instituted for pin trading to be on the lookout are a small silver Mickey emblem on the front of the pin and a Mickey ear pattern on the reverse. If your Target pins lack both of these you might run into opposition but probably not.