Never have heard a BOBCAT do this, though I've called quite a few and live among good numbers of them.
But I do frequently hear GRAY FOX make what could best be described as a cough-bark. Seems to be some sort of a warning call, like a snort-wheeze for a deer. Once in a while after I call one in, it'll sit out in the brush cough-barking, complaining that there wasn't a live rabbit anywhere to be found at the end of the line, perhaps?
Sound might just call a bobcat now and again, though.
LionHo