Answer:
Many have heard it, but nobody has ever seen it. It will not speak until spoken to. What is it?
Whiling away the hours of flowers, Walking through fields of gold. Preening and pruning in lights fading hours, For petals to freeze in the cold. What is it?
I know a word of letters three. Add two, and fewer there will be!
A house with two occupants, sometimes one, rarely three. Break the walls, eat the boarders, then throw away me.
Look into my face and I'm everybody. Scratch my back and I'm nobody.
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.