Hi Tim,
My knowledge of French framing is insufficient to answer your question with full confidence as to whether or not cruck constructon exists either in a localised fashion or on a more widespread basis in France.
Alcock et al (Merrion Jones) do make mention and provide examples of continental cruck construction in The Cruck Catalogue (your web reference is an extract from this book).
If you do not have a copy of this book then please PM me and I will send you a pdf file of the whole book (now out of print).
Regards
Ken Hume
