Well, yes cold spoons can be used to treat puffy eyes. Generally speaking, there are many people who suffer from puffy eyes, and puffiness on eyes will just make them look older than they are. And in common, puffy eyes are a symptom of lack of sleep, allergies, and nasal congestion. To treat it, there are many ways you can have a try. For example, cold spoons can be very beneficial. First, you can just place the spoons in the freezer overnight, or at least 2 hours so they can get really cold. And then, you need to hold the spoons directly on the puffy areas for 10 minutes. Of course, you need to refreeze the spoons and repeat this step until the puffiness alleviates. Also, ice cubes can be applied too. So just have a try.