I don't know if they have Korean Tamagotchis specifically, but I know that a lot of countries will have an English Tamagotchi, and then localize the actual physical instructions accordingly.
For instance, I have a V4 and V4.5 that are apparently "Chinese". Having said that, it is identical to an American V4/V4.5, while possessing instructions in Chinese.
I think from a company's standpoint, it's simply easier to rerelease a product and make necessary adjustments accordinly as opposed to translating a product simply for one market.