The Collaborative International Dictionary of English v.0.48:

cock's-eggs \cock's-eggs\ n.
   a weedy vine of Argentina (Salpichroa organifolia) having
   solitary white flowers followed by egg-shaped white or yellow
   fruit.

   Syn: cock's eggs, Salpichroa organifolia, Salpichroa
        rhomboidea.
        [WordNet 1.5]