Answer:
I can be as thin as a picture frame but my insides have many things you can see.
Brings you May flowers
I'm a starchy plant tuber that is one of the most important food crops, cooked and eaten fried, such as french fries.
What loses its head every morning only to get it back every night?
Handy when you need to measure something or run a kingdom.
A leathery snake, with a stinging bite. I'll stay coiled up, unless I must fight.