We don't have fruit and nut bars at my store, but I think I vaguely remember having them a while ago. Are they packaged? Packaged food should have ingredients on the label, or ask to see the box. If it's unpackaged (in the pastry case), asking a barista is usually pointless. We don't make any of our own food, and most of the stuff comes labelled without ingredients or nutritional info. If you go to starbucks.com you can see calories, etc., but they have no ingredients. If you want to know, you can call 1-800-23latte. Or, you can ask a nice worker if they can call the pastry distributor for their area and get ingredients on a certain product (ask for a supervisor or manager when doing this).
With the other cafe you go to, I would just ask to see the bottle for the pumpkin flavoring. Hope this helps!