I am a Swiss, living 20km from Fribourg and having a lot of contact with people from Fribourg. I thought the same as the parent. It seems also that most words are actually spoken in German and only a few nouns are French.

I have a friend speaking Le Bolze. When he is around Swiss Germans, he still speaks it, altough in a much less pronounced fashion. He uses much more German words and only occasionally the odd French word.