Answer:
You fill it and it empties, A metaphor for plenty, Depending on what half you see, It's either full or empty
A person who chews the ends of their fingers
I have a pet, his body is full of coins
No matter how little or how much you use me, you change me every month. What am I?
I'm a starchy plant tuber that is one of the most important food crops, cooked and eaten fried, such as french fries.
It's what light turns into in the night
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?