I found the other mention of Vronkal (apart from Elder Secrets); in the
"Elf, Green" entry of the Gloranthan Bestiary, where it says "Vronkal,
Lord of the Forest". Perhaps that's a literal translation, in fact?
Greenly,
Alex.
End of Glorantha Digest V4 #337
WWW at http://rider.wharton.upenn.edu/~loren/rolegame.html