What's an Egg Corn?

LOL dolls are popular enough that my daughter got a couple of these toys as gifts from other kids in her class. They look like very sort of like bling glamorous, but also kind of like, I don't know, I feel like alien. What's an egg corn? Well, that corn is where you say something a little bit and people call acorns, egg corns because they think they are shaped like an egg,. so they should be called an egg. But basically, you could, all these things, like people saying things wrong that still make sense. There's tons and tons of them - it's like a 40-slip.