Answer:
A spent round or a slimy critter.
The homes of tiny creatures that collect in corners if you aren't vigilant about dusting.
I have a pouch on my belly where I carry my babies. I hop around Australia. What am I?
It rows quickly with four oars but never comes out from under his own roof. What is it?
In the fields a frightful thing. Watch it and you will find, it has a pitchfork in the front, and a broom back behind.
I love spinach.