Hello. Would you please tell me what 'cozzler' means in this context below? Thank you.

(These sentences are from a picture book for children.)
--- Once, I met a Django.
A what?
A Django. It's like a thing. A sort of it. A kind of cozzler that can easily find trouble.
It was standing inside our home one day, staring at Papa's banjo and saying, "Cor, lovely!"