"The Rooky Wood ~
Not the wood where rooks do congregate,
But the misty or dark wood.

The verb reek (to emit vapour) had the preterite roke, rook,
Or roak; hence Hamilton, in his Wallace,
Speaks of the 'rooky mist.'

'Light thickens, and the crow
Makes wing to the roaky wood.'

Shakespeare.
From 'Macbeth'
[iii. 2]"

~ E. Cobham Brewer,
From "Dictionary of Phrase and Fable"
[1898]