Hey no crappie isn't a bigger version of perch. At least not the perch we are talking about. Crappie are good eaters though.
The Yellow perch is a member of the walleye family. A smaller cousin. Crappie are a member of the bass/bluegill family. Different parts of the country call fish different things.
If you ever get a chance to eat walleye or yellow perch, do it. It'll be a treat.