Answer:
You're gonna need a bigger boat to go after one of these toothy hunters.
Slithery critters with a taste for dirt.
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.
The ones in the sea are prickly, but the ones on the street might pickpocket you.
It can be white or blue or black, Humped or have a horn. And when it talks it sings its menuets, as it's travelling the depths.
A leathery snake, with a stinging bite. I'll stay coiled up, unless I must fight.