Consuming a small amount of freezer ice during defrosting is unlikely to cause immediate poisoning or severe harm. Freezer ice is typically made from the same water supply as the ice you would get from your tap. However, it's important to note that ingesting a large amount of ice or consuming ice that has an unusual taste or odor could potentially be a sign of a problem with your freezer or the ice itself.
If you believe you may have punctured a metal coil and ingested coolant, it would be best to seek medical advice. While most refrigerators and freezers use refrigerants that are generally considered safe, ingesting coolant could still pose health risks, especially if consumed in large quantities or if the coolant used is toxic. Only a medical professional can properly assess your situation and provide appropriate guidance based on your specific symptoms and circumstances.
In the future, it's important to avoid eating ice from the freezer during the defrosting process, as it may contain impurities, residues from cleaning products, or other substances that could affect its taste and safety. If you have cravings for ice, it may be worth discussing this with a healthcare professional to determine if there is an underlying medical condition that needs attention.