Frozen Slices of Bananas, Still Good or No?

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Okay, so since about a month ago I've been cutting up slices of bananas and putting them in the freezer. However, I was in and out of the hospital for a long while, and as I returned to my bag of frozen banana slices to use in my protein shake, I've noticed that they're a bit on the darker side and quite brownish and there is some kind of brown goop in the corner of the bag. Are they still good to use?

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