Talk Fantasy Football

Where can I find the stats for Bretonnian teams? Do they even exist?

They do exist in the Blood Bowl 2 computer game.
In the boardgame rules, they do not exist, only as inofficial house rule roster.
You can find that somewhere in the "General" forum, there is a thread discussing them.

Here's the pc game guide page. It's missing skill access; linemen are G/ASP, blockers are GS/AP, blitzers are GP/AS

http://guide.bloodbowl-game.com/en/races-bretonnians

I confess I don't know what stars they use.