Here is Raised Fishbone Stitch,
and I hope the pictures are enough to explain the way to stitch it.
Beware, this stitch is certainly a thread-eater!
Mattia tells me the two names in French are:
Point d'arête en relief
Point de passé plat croisé
SSS Reference Chart
Teal tailoring wool scribble cloth
Aida sampler, if possible.