Answer:
It is an insect, and the first part of its name is the name of another insect. What is it?
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.
It has plenty of backbone but doesn't have a let. It peels like an orange but it comes from an egg.
I'm carried by mad animals. What am I?
The ninja turtles call this place home, as do mythical alligators.
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?