White frost is a solid deposition of ice which forms directly from water vapour contained in air.
White frost forms when there is a relative humidity above 90% and a temperature below −8 °C (18 °F) and it grows against the wind direction, since air arriving from windward has a higher humidity than leeward air, but the wind must not be strong or it damages the delicate icy structures as they begin to form. White frost resembles a heavy coating of hoar frost with big, interlocking crystals, usually needle-shaped.
You are both right as white frost cannot form in strong wind conditions and what forms on a wing with high speed air flowing over it is more likely to be hoar frost which technically is not frost
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