 Do not say one corn two corns That's wrong Say it right in English one kernel of corn two kernels of corn Or a grain of corn We're counting the individual seeds here a cob of corn an ear of corn. This is a larger unit We can also say two ears of corn Sometimes people say corn on the cob To count the containers you can say a bowl of corn or Two cans of corn or for larger containers You can say a bushel of corn or a basket of corn or three bushels of corn If you're talking about the plant growing on the farm you can say a stock or stocks of corn or corn stocks To learn more about this topic see video at link or Check out our websites for more free English learning resources eslgold.com and free English study dot com