I have caught both and eaten fresh filleds of both and I am hard pressed to tell the difference. My largest Cod fish is 22 lbs and my largest Pollock is between 3 - 4 lbs, the size of the fish does make a difference in the taste the smaller are better tasting than the bigger fish. It has become very difficult to catch Pollock around here and you can still catch the occasional Cod locally.
All I can say is "we can".