I should probably wait for someone British to reply, but I'll take a guess. , corn that people eat is just called corn (canned, frozen, or fresh, on the cob). However, I think that in England, corn that is eaten by people is called sweetcorn to distinguish it from types of corn used to feed animals.
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"Why droops my lord, like over-ripen'd corn
Hanging the head at Ceres' plenteous load?"
"What valiant foemen