my reasoning:
Fish 1: Osseus, slender body, long narrow snout. and color/pattern of an average juvi Longnose.
Fish 2 and 3: Both look like Platyrhincus or Oculatus. But since you and Richard can ID a gar almost reguardless of size i just guessed not knowing which is which. (i havent had enough personal experience with each species to tell most juvi's apart.)
Fish 4: Platostomus, i did some research and went to Primitivefishes.com and this one looks very similar to most of the shortnoses there. almost the same coloration, broadness and length of snout look to be about the same.
or i could be completely wrong and be sounding really stupid right now.
but hopefully not.