The Collaborative International Dictionary of English v.0.48:

Drakestone \Drake"stone\, n.
   A flat stone so thrown along the surface of water as to skip
   from point to point before it sinks; also, the sport of so
   throwing stones; -- sometimes called ducks and drakes.
   [1913 Webster]

         Internal earthquakes, that, not content with one throe,
         run along spasmodically, like boys playing at what is
         called drakestone.                       --De Quincey.
   [1913 Webster]

WordNet (r) 3.0 (2006):

ducks and drakes
    n 1: a game in which a flat stone is bounced along the surface
         of calm water