Which of the following symptoms indicates frostbite?

Tingling is a key symptom that indicates the onset of frostbite. When skin is exposed to cold temperatures for a prolonged period, the blood vessels constrict to preserve body heat, leading to reduced blood flow to extremities. This constricted blood flow can result in sensations of tingling or numbness, which are signs that underlying tissues may be freezing.

Recognizing tingling as a symptom is crucial because it advises immediate action to rewarm the affected areas and prevent more severe injury to the skin and underlying tissues. The other options listed do not typically relate to frostbite: fever and cough suggest an infection or illness, while a rapid pulse may indicate stress or a more general response to cold but not frostbite specifically.