Answer:
My first is a heir; My second's a snare; my whole is the offspring of fancy; which I sent out of play upon Valentine's day As a token of love to my Nancy.
Lighter than what I am made of. More of me is hidden than seen. What am I?
I come without being fetched at night, hide away as soon as daylight strikes. Although I may look small, I am much mightier than what you can imagine. What am I?
The more of me you take, the more I appear behind you. What am I?
turkey day
No matter how little or how much you use me, you change me every month.