They didn't have one that particularly devoted to one item of produce. Ceres is traditionally listed as a Goddess of growing plants, and of grain crops in particular. From her name we get the word cereal which we still use to describe these crops.
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The goddess of agriculture (and therefore corn) was named Demitra.
The Roman goddess of the hearth was Vesta. The Roman goddess of grain was Ceres.
Felicitas was the Roman goddess of happiness.
The Roman goddess of truth was Veritas.
Veritas was the Roman goddess of truth.