Loose corn is used to describe corn that is not in the natural cob state. It can come in a can, frozen or have just been manually removed from the cob. Just saying "corn" isn't clear so we must conform to the binary options of "loose corn" or "corn on the cob".
Edric: Let's order the corn. Does that sound good to you?
Veronica: Depends on if it's loose corn or corn on the cob.
Edric: Good call, this isn't completely clear and madness. Let's check with the waiter.