Oden isn't the famous kind of Japanese food that tourists come to the country for, but locals and expats know it all too well.
It's a sort of cuisine – it's a collection of things that are boiled in a fishy broth. Everything that comes out is hot, and most of it is pretty heavy on the protein. So, it's really known as a winter food.
Oden is found everywhere. During the coldest winter months, you can find it in every convenience store, and the stores will even smell of the stuff during that time.
Here's a more detailed explanation from the Japan Visitor Blog:
Dashi [the broth oden is made in] is made with konbu seaweed and shaved tuna flakes (kezurikatsuo), so oden is not really vegetarian, though many of the other ingredients are staples for non-meat eaters: daikon radish, potatoes, konnyaku, kinchaku (mochi in a deep-fried tofu pouch) and tofu. Other things found in oden include boiled eggs, chikuwa fish cakes, folded seaweed, meatballs on sticks, sausages, octopus and sometimes skewered beef.
Personally, it's not for me. But at least I was brave enough to try it.
More Japanese Food Not Found in America
The Japanese don't really do teriyaki chicken. Here are 6 Japanese foods not found in America.