Yes you can. Any official Disney pin can be traded with CM's at the parks. And there is quite an active pin community in NJ. What part of the state are you in?
I am in Monctlair, and have been involved with pins 25+ years. There is a group in Central Jersey, the Central Jersey Disney Pin Traders that is very active, in Somerset I believe. Another in Bergen county. I am not sure about any others, I know there was one in South Jersey, but don't know the status of it. Also on the DIS there is a collectors board, some pin folks hang out there. Are you familiar with Pinpics and Dizpins?