Ich habe diese aus Frankreich mitgebracht. Ist es möglich, sie in Deutschland oder auf einer französischen Website zu finden und zu versenden? (Fermentierte Milch, aber kein Kefir)

Try Sauermilch.

If Google is right you should look for Dickmilch in Germany. In my opinion what you can buy at Bioläden called Schwedenmilch is the best. It’s thick but not too thick (like Dickmilch which is sold as stichfest mostly) and quite sour/fermented in taste.

Grew up with homemade fermented milk. Was a thing in Germany at least in my grandparents generation.

In Turkish stores you can find either “Laban” “Leben” or “Labn”, all of which refer to fermented milk of the same kind. Occasionally you can even find it in Kaufland in places where a large Turkish or Arabic diaspora live, such as the Ruhrgebiet

You could also try to just produce your own using this product as ” mother culture”. I am a dairy technologist, but I don’t know that product. I am especially lacking the information what kind of bacteria was used for fermentation. I would guess mesophile which means you could just mix 100 ml of this product with 900 ml milk and let it ferment at 20°C. I would guess it could take up to a day or two But I would check on it every few hours.