Welcome to WebmasterWorld Guest from 184.108.40.206
Forum Moderators: open
To quote from the Froogle team*:
Tip one: Use your own category structure – we’ll map your products to Froogle.
We do it for you! We will manually map your store's product categories to our own hierarchy. All that we ask is that you include the same category information in your data feed as those on your product pages.
* from their newsletter.
So, as Scott says, just leave it to them.