Corn on the cob is a special treat for the Finsters, since it is food and a toy all in one. But frozen corn (off the cob) is mighty convenient, and actually Peanut seems to prefer it. I fill up a bunch of containers at once with the right amount of corn plus a few mostly ignored peas, and fill up the freezer. Then I put one into the fridge to thaw the night before I need it. An easy treat.
Your experience may vary, but here is how my birds eat corn:
Parrotlet: As with most food, corn is tastiest when you eat it straight from the container. This way you can take a little bite from a lot of items, and go back for the leftovers only if you're still hungry. Don't eat the skin of the kernel, it's just like the hull of a seed. Instead, squish the kernel until the inside comes out: bite that, and drop the rest. Try to drop a few squished kernels onto the floor. When you're finished, wipe the corn squeezins left on your beak onto somebody's arm. Fly home for a drink of water and a spit ball or two.
Click here for a Corn Closeup.
Society Finch: As with most food, corn is tastiest when you sit in the dish, on top of the food item. This makes for good toe-picking later, too. Don't eat the skin of the kernel, instead poke either your upper or lower mandible (beak) into the open end, and suck out the tasty insides. You'll need to roll the kernel around on your beak to get all the bits; feel free to take a kernel with you when you fly up to a perch.
Zebra Finch: Don't eat the skin of the kernel, instead squeeze the kernel in your beak until the insides come out, then eat the insides. The process requires a squeeze-flick-catch-eat action, which can take some practice. Don't be alarmed if you flick a few kernels onto your head. Eat peas the same way.
White-Headed Nun: Once a month, or so, hop onto the edge of the dish of corn kernels and look at them. Since they're not seeds, hop away.