Source : Webster's Revised Unabridged Dictionary (1913)

Pung \Pung\, n. [Etymol. uncertain.]
   A kind of plain sleigh drawn by one horse; originally, a rude
   oblong box on runners. [U.S.]

         Sledges or pungs, coarsely framed of split saplings,
         and surmounted with a large crockery crate. -- Judd.

         They did not take out the pungs to-day.  -- E. E. Hale.

Source : WordNet®

pung
     n : a low one-horse box sleigh