Not that I know of (though others may educate me by reply).
FMP Advanced has a database Design Report that provides this info.
When I culled fields using FMP8 (not advanced) I would screen capture the field list from Define>Database, paste it into ppt, print it out, and go through each layout highlighting the fields on paper. The ones that never got highlighted were inspected for their current function and often deleted.
This was a painful process, so I upgraded to Advanced and now use the design report to do the same thing. It's much quicker and less tedious.
Ninja -- Thank you. This will probably be my best method for the moment, though might consider Advanced for the future, depending on other needs.