Franck Sauvage adventures have appeared in weekly episodes in the Journal de Mickey during the late 60s and early 70s as "Nouvelles aventures de Franck Sauvage" . The translation were shortened and softened for the younger audience. Each episode also had some original art. Doc's aides are still called Le Gorille (Monk) and Ted (Ham). Any information on this publication will be welcomed! 

So far, I have identified three novels "Le naufrage de l'Océanic" (The Polar treasure) published in 1967 and "La neige rouge" (Red Snow) published in 1968, both credited to "Opera Mundi"  and "Le magicien de la mer" (The Sea Magician) published in 1972, without credits.

Here are the detailed publication dates (bold lines are for the episodes I own). Some starting and ending publication  dates are my best guesses, taking account of the stories progression for the episodes I own, but I might be off by one or two.