I have made chocolate swirls and stuck them in the freezer for a little while and put them on my cake. They turned out fine. They only stayed in the freezer maybe 20 minutes at the most. The house was hot that day and it was taking too long for the chocolate to harden so I popped them in the freezer. They didn't turn white, maybe because they didn't stay in there that long.
Sometimes, when you freeze chocolate it can get a kind of white coating on it. It doesn't ruin the taste, though. I have frozen chocolate chips, bought them in bulk and saved to make cookies or to go in cakes and they always tasted good.
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