What I found is that written evidence for knocking on wood (and for the history of gesture as a whole) is remarkably sparse. In the Penguin Guide to Superstitions, folklorist Steve Roud offers a skeptical take on the provenance of knocking on wood due to the near total absence of written records about it:
The British snacks giant said it had entered into a consultation process over Tyrrells-brand vegetable crisps following a "sustained decline in demand and the loss of key export volumes".
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Раскрыты подробности о договорных матчах в российском футболе18:01
A screenshot from Skyrim: Home of the Nords.