Answer:
My first is twice in apple but not once in tart. My second is in liver but not in heart. My third is in giant and also in ghost. Whole I'm best when I am toast.
According to the ads, this is the favorite beverage of friendly polar bears.
The strangest creature you'll ever find: Two eyes in front and many many more behind.
Those with eyes bigger than their stomach will definitely leave the restaurant with one of them. It is named after a house pet as well.
In the fields a frightful thing. Watch it and you will find, it has a pitchfork in the front, and a broom back behind.
What is always coming but never arrives?