Well, it depends: Are you looking at Version 1 or Version 2?
Version 1 Marutchi: Hinotamatchi (odd-numbered generation) or Oniontchi(even-numbered generation) (also sometimes Ichigotchi only on the first generation)
Version 2 Marutchi: Hinotamatchi, Puroperatchi (even-# gen.), Ringotchi, Young Mametchi, UFOtchi, Oniontchi, Nikatchi (odd-# gen.)