This was a new one on me. I spotted an ocarina 78 by Andréany and mentioned it on an ocarina forum. Somebody else did some digging and found he was better known as "Andréany The Yodelling Tramp", and made a bunch of yodel 78s with his collaborator Blangy and his orchestra. Like this:

The Shepherdess Yodel
on French TV in 1967, with papier maché cows

Following links from the YouTube, there seems to have been a cottage industry of French yodelling in the early 20th century.

Is it a long-established folk art in the Francophone parts of the Alps?