These first two pics show Calico, one of the feral cats that help themselves to the food set out to lure the fox.
The fox has his mouth open in each of these three pics. The one in the middle looks like he's making a noise, perhaps one of the sounds you hear in What does the fox say -- an entertaining video which attempts to explain the sounds a fox makes. I hope he's getting enough to eat, because the cats beat him to the food most nights. Notice the temperature in the one on the far right, 10 degrees. Brrr.