Can these forums be googled?

But you'll note that there is no directory structure beyond what you entered, so there are no pages to be found by the search you tried at Google. See here:
http://www.google.com/search?q=+site:portableapps.com+toucan

If you want to find something specifically about Toucan in the forums, you're far better off using our search engine directly rather than Google. You'll see an Advanced Search option (click it) which lets you only search forum posts:
http://portableapps.com/search