It was a kiso, obviously.

I don't get what they are playing.

Kuma and Tama are trolling Kiso. They'd set up a pattern of call-outs, then switch up the call-outs to trip Kiso up.

Bear and cat outsmarts... hmmmm what animal is Kiso?

(By the cloak, eye-patch, and ARHGBLBEL Kiso is a pirate probably. ARRRR)

The older sisters are picking on the youngest sister now that Oi and Kitakami are....busy.