Joseph, I cold never find a definitive answer about it, but I suspect not. Fish often swallow all kinds of things when they eat that they just pass. I have cut open steam trout and found sticks and pebbles in the gut, old hooks, soda can tabs, vegetation, etc. I find it suspect that they couldn't pass corn niblets.
Maybe some stocked fish on opening weekend eating virtually nothing but corn and then having it start to ferment and bloat them started this thig rolling, but most hatcheries use some form of grain and meat mix in the pellets they feed to fish daily, so again, my opinion is not an issue w/ corn.