Question: what are nana and popo?
Answer: The in-game sprites of Popo (left) and Nana (right) from Ice Climber. The Ice Climbers (アイスクライマー, Ice Climber) are the titular protagonists of the game Ice Climber. Individually, they are known as Popo (ポポ, Popo) and Nana (ナナ, Nana), and are differentiated from each other primarily via the color of their parkas.