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.
What build its house with earthen string and ensnares its prey with a biting sting?
To you, rude would I never be, Though I flag my tongue for all to see.
What is sacred, holy, female, and noisy?
Creeping on its belly, curled into a ring. Eyes forever open, beware its lethal sting
The sun bakes them, The hand breaks them, The foot treads on them, And the mouth tastes them. What are they?