Definitely toss them... My airhead brother cooked some that looked like that once, and he ended up with one doozy of a stomachache for the rest of the night. I tried to tell him that anything that grows fuzz, whether it's soft or not, should be thrown.
The exception to that, or so my mom told me, is cheese because dairy farmers use mold to make cheese. But in my experience, it still tastes bad. I had a small chunk of colby/jack that was left after shredding for dinner and I was going to snack on some cheese & crackers. There was fuzz on one end, so I cut it off, and cut me a fuzz-free slice. UGH, it tasted horrible. You know how you can tell what something is going to taste like just from the smell? Well my cheese tasted like the fuzz smelled. I thought maybe I hadn't cut enough off, so I cut another good-sized chunk off and tried another piece of cheese. It was just as bad, so I threw that cheese away. And I make sure to use all my cheese within 5 days of opening it. I know it can last longer, but I do it just to be safe.
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