The Collaborative International Dictionary of English v.0.48:

Poppit \Pop"pit\, n.
   a small plastic bead with opposed holes and protuberant
   knobs, so shaped that the beads may be fastened to each other
   in chains and detached easily, and can be used to form
   variable-length chains for use as necklaces, bracelets, or
   other ornamental objects. Also called poppet and poppit
   bead.
   [PJC]