mbcakes,
I'm going to have to lean towards agreeing that French "Langues de Chat"
cookies/biscuits (aka "Cat's Tongue" and "Lenguas De Gato") may be an alternative to Pepperidge Farm's Bordeaux cookies. They are thin and crisp as are the Distinctive Bordeaux Cookies. A chocolate coating is optional as is sandwiching chocolate in between two cookies as are nuts.
You may want to check the
The French Cookie Book: Classic and Contemporary Recipes for Easy and Elegant Cookies By Bruce Healy to see if you can't find something else.
As Kyle stated, the Pepperidge Farm version is rectangular with rounded corners. No icing or chocolate. Sheer simplicity.
Here are several sources for recipes you may want to check out:
Langues de Chat Langues de Chat II Langues de Chat III Langues de Chat IV Langues de Chat V Langues de Chat VI Langues de Chat VII Langues de Chat VIII Langues de Chat IX Langues de Chat X