First is Twice in Apple
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 roast.
What am I?
You are a pig.
I Never Even Touch the Ground
For some, I am used to get around.
I never even touch the ground.
Sometimes I fall and sometimes I float,
If I’m in the air, then take note.
What am I?
A boat. Boats are used to get around, they aren’t on the ground, but in the water. They rise and fall with the waves, and if they’re in the air, it may be due to rough seas and you should be careful.
Another possible answer is a blimp.
The Thinner It Grows
You use me from your head to your toes.
The more you use the thinner it grows.
For years I was not often used,
Not using me now is not excused.
Soap.
Spit Like Bacon, Made With an Egg
I spit like bacon, am made with an egg,
I have plenty of backbone but lack good legs,
I peel like an onion but still remain whole,
I’m long like a flagpole, yet fit in a hole
What am I?
A snake.