Usually the crocodile symbolizes the voracious quality of the unconscious, the danger from below which suddenly comes up and pulls people down.
Jung establishes the crocodile's primary psychological valence as an emblem of the unconscious's devouring, suddenly eruptive danger, while simultaneously acknowledging its protective 'doctor animal' function among African peoples.
, Dream Analysis: Notes of the Seminar Given in 1928-1930, 1984thesis