pick or prick?
That depends on the company your in.
If you're around some rowdy types, you can call it a "coon whistle", and see if they'll stick it in their mouth and blow on it. When it doesn't make any sound, tell 'em they need to blow harder. It's usually good for a laugh, if only to yourself.
For the unknowing, here's a picture of a "coon pick", taken next to a quarter laying on a buffalo robe. Sorry about the quality; since my camera's battery was dead, I took it with my cell phone.