The Collaborative International Dictionary of English v.0.48:

Cragsman \Crags"man\ (kr[a^]gz"man), n.; pl. Cragsmen (-men).
   One accustomed to climb rocks or crags; esp., one who makes a
   business of climbing the cliffs overhanging the sea to get
   the eggs of sea birds or the birds themselves.
   [1913 Webster]