Thanks for your response freemama. That sounds more like what we believe the Salmon Croquettes of Yore were.
What we found in our search involved flour, Bisquick, and ingredients that would have made the croquettes heavier, more laden with breading, etc. than we recall of those croquettes we enjoyed in the fifties, and sixties.
We also know our parents were not into deep frying anything as so many recipes in our search called for with the croquettes, and we remember too the hot cast iron skillet with the vegetable oil browning those coquettes prior to them going into the oven.
I’m really wound up on this, and I’m going to play with it until I figure this out. I’ll post results someday down the road.
I have an old “Farm Journal” cookbook from the 40’s. No croquette recipe, but there was one for “Salmon Loaf” with the exact ingredients you described...plus minced green pepper.