An Elf Named Nack

There was an elf whose name was nack He did such things as others lacked But then one day he got a nick Upon his knee right from a pick They laid him up so he could heal Upon a shelf by window seal Though never would he work again He'd give a smile when one passed him In time his name would come to mean A little thing a figurine Now some that sat upon a shelf Must surely look just like this elf