Malheuresement, non. Je suis désolée! But I imagine if you call and ask for a “Dummy board” (British english name for it), somebody may know what you mean. “Follower board” is the US name. If you want to describe to them in French what it is, this is the concept. It is a Langstroth size frame, but you can’t put wax in it, instead the middle is a solid piece of wood. It is used to make a “false wall” for the bees. You could probably build one if you shave a little (2-3mm) off the edges of a standard Langstroth frame, then glue and nail some 1cm thick plywood into the area which normally has wax foundation.
I try not to use them, but about one hive out of four seems to need one to get the edge comb built properly.