What is what kind of rice cake is this?

It appears that the rice cake in question is a Korean dish called tteok. Tteok is a traditional Korean rice cake made from glutinous rice flour that is pounded into a sticky dough and then shaped into various shapes and sizes. It can be sweet or savory, and is often used in a variety of Korean dishes and desserts. Tteok can be steamed, boiled, pan-fried, or grilled, and is commonly enjoyed as a snack or as part of a meal.