> höfða-fjöl, f. "head-board, board against which the steersman rests
> his head or back" (Turville-Petre).

Some more examples:

http://www.lexis.hi.is/corpus/leit.pl?lemma=h%F6f%F0afj%F6l&ofl=&leita=1&flokkar=Fornrit&m1=h%F6f%F0afjala+h%F6f%F0afjalanna+h%F6f%F0afjalar+h%F6f%F0afjalarinnar+h%F6f%F0afjalir+h%F6f%F0afjalirnar+h%F6f%F0afj%F6l+h%F6f%F0afj%F6lin+h%F6f%F0afj%F6lina+h%F6f%F0afj%F6linni+h%F6f%F0afj%F6lum+h%F6f%F0afj%F6lunum+h%F6f%F0a-&l1=Leita&lmax=1