Chatterbox

Chatterbox or Chats is a puppet that helps Raven in the Word Play Segment.

Creature & Box
They have never said what kind of creature is Chatterbox, but in Let's Celebrate! video, we can see a long-bodied Chatterbox, like a worm. She lives in a box, that is full of stuff. Kellie Crawford is able to get inside in Hi-5 Series 8, Episode 18 ("Being me" skills) and in Hi-5 Series 9, Episode 28 (Adventure). Casey Burgess visits Chats' place too in Hi-5 Series 13, Episode 18 (Fantastic buildings). The way to get in and out her box is to stretch arms out wide, cross the fingers and turn around.

Gallery
See here