Deep Freeze is Maximus Mayhem’s mask, used when he drives Buzzard, and it fires a ray of cold energy. The fan wiki lists five second-season episodes and says the mask looks the same as his brother’s Flexor apart from the green forehead. Wikipedia’s character list and Matt-Trakker.com agree on the wearer and the power.
None of our Kenner toy records for Buzzard lists a Deep Freeze mask.