What's the Name of That Book??? discussion

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Call It Courage
SOLVED: Children's/YA
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SOLVED. Polynesian Boy Conquers Fear of Water [s]
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He finds an island. There he starts to make his living, encountering a few terrible beasts of the sea, and overcoming, including an octopus and a shark. However, the island he has discovered has occasional visitors, and these visitors are hungry. They are cannibals.
When they discover him, a great sea chase ensues, and he finally outruns them, and then returns to his home island. He is tall, built, and has a necklace of shark teeth, and they don't recognize him.
I can't remember the title or author.