Potatoes do not produce toxins after freezing, but be aware that sprouted potatoes can produce lobelia toxin, so pay attention to the state of the potatoes before freezing.
Potatoes in the state of sprouting or green skin, the body will produce lobelia, a small amount of consumption will lead to abdominal pain, vomiting and other symptoms, most can be relieved on their own, after taking more, it will be due to increased body temperature and repeated vomiting and so on, resulting in water loss, but also can be accompanied by respiratory difficulties, blood pressure drop, should be sent to the hospital in a timely manner to rescue.
But simply after freezing is not a toxin, but before freezing should pay attention to the state of the potato, if it is sprouted potatoes are frozen and eaten, will also be poisoned.