1938 Snapshot, Rockland, Maine: the Fish Man; F. M. K. and little Dorothy Christofferson

1938 snapshot from Rockland, Maine, showing "the fish man; elderly F. M. K. and little Dorothy Christofferson.

Dorothy was presumably Dorothy Christofferson (1932-2016), daughter of Carl Alvin Christofferson and Dorothy Rae (Mank) Christofferson.  Dorothy married 1) Henry Augustus Conary; 2) Walter Benjamin Whittier; 3) George Arthur Hoxsie.

I searched for a grandfather or great grandfather of Dorothy with a surname beginning with K and didn't find one.

F. M. K. was perhaps Fred Murray Kittredge (1872-1951).

If you can further identify F. M. K. or the "fish man", please leave a comment for the benefit of other family researchers.