I heard 3 different bucks grunt. A few years ago while bowhunting in the rut, I was sitting on a large open alfalfa feild watching 3 does on the corner of the feild. Then a nice 10 point came running across the open feild after them, grunting for a good 4-5 times in a row. He was 70 yards away and it was easy to hear the deep grunt, grunt, grunt, etc, from him running. I have also had a couple small bucks up close within easy bowrange on the ground, and make a couple grunts. I know I wasn't hearing anything, and am 100% sure they were grunts. But they don't do it all that often, mainly just in the rut.
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