Yes, I had a dream once where an (extremely hot) girl from my german-education video was speaking to me in german and I was responding fluidly.

I later realized that I was speaking pure gibberish though.

Alot of my dreams are in partial german, but when I translate them they make little sense.

"Mein haus ist deine gebaude!"- my most fluent german phrase in a dream, which translated means something like, "My house is your building"...which doesnt make much sense.