BR04;All in a flap

"I'm not a Niggly Nagbag!" (page 11)

The main character of this story is Donut, and I thought it is a doughnut. He brought a parrot for his friends, but I wondered why his friends didn't show Donut their secret room.

By the way the auther of this story is used "Nagbag" many times, what is Nagbag? I searched my dictionary, but it was not appearing on my dictionary.

Strong, J (2004) All in a flap. Literacy Land.