Picking up children in the woods is a perfectly normal way to expand your family (if you're a pirate).
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Another installment of Stinky Child Ace~ You can read the first part here!
(About Crocodile being referred to as "Wani": he's already known as the Warlord Sir Crocodile, so it's best to use an alias and hope that nobody in this quiet, peaceful village will make the connection. And if they do, that they'll keep quiet. Which they most likely will, considering that they must have noticed Dragon's return to the Monkey family home.)
Sorry for style inconsistencies X'D