They're cute, they're little and they have lots of adventure!
Yes. It's Chibi Kero.
Titles: Chibi Kero, Little, Little Adventure! De Arimasu! / Zeroro, I finally Found Kikaka. De Arimasu!
Sometimes these episodes are in 3d or just 2d.
Anyway, there's also Chibi Kururu.
Next up is Giroro & Natsumi episode! How's that? Kekero!