Flotsam and Jetson Waifs found in the sea or on the shore. "Flotsam,"
goods found floating on the sea after a a wreck."Jetson," or Jetsam, things
thrown out of a ship to lighten it. (Anglo-Saxon, flotan, to float; French,
jeter, to throw out.) (See Ligan.)

My dictionary does give meaning of "waif" = anything found by chance that
does not have an owner, but I have never seen it used except to mean
a homeless parentless child.