I'd imagine testicles wouldn't make a good waffle. If your definition of waffle is batter cooked with a raised grid pattern on either side, then they wouldn't fit the bill. I don't think they would conform to the conventional waffle shape very well when cooked. You might get some imprint on them, but not much I figure, probably more so if they were left intact inside the sack but whether removed or not I can't see them taking on much form. It would be like putting a cow tongue or a thin pork chop in a waffle iron. They wouldn't cut well with a fork, and butter wouldn't soak into them very well. Syrup may make them taste a little better, though. But over all, I'd take a real waffle instead. I'm fairly certain a majority of people would be able to differentiate between the two in a blind taste test, thus proving that no, testicles would not make a good waffle.