Americans use the term "corn" to designate what is generally known as maize in the Old World (although American culture continues to infiltrate its usage since the end of World War II.
The term "corn" in English usage at the time the Masonic ritual developed, meant any grain but most often wheat. 'Corned Beef' was originally beef cured with salt granules, the size of wheat grains or wheat 'corns'.
So! No! There was no corn in Israel or Egypt or anywhere in Eurasia/Africa until brought over from the New World after its rediscovery by Columbus in 1492.