They do usually have pads (not nuptual pads) that are like calluses which help them dig. Maybe that is what you are seeing. I thought Grif's were nuptual pads at first too. Grif did make cheeping noises when she was a baby. You'll definitely know the call if you here it. I can usually hear Loki when I'm two rooms away. If he gets any louder, the neighbors will probably start complaining! LOL