Answer:
The ones in the sea are prickly, but the ones on the street might pickpocket you.
They're actually great swimmers now, but later they will become excellent hoppers.
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.
Known for their natural tuxedos and marching.
Microparasite expert at sucking the blood of mammals and birds
I hold two meanings. With one I may be broken, with the other I hold on. What am I?