What secret did Piggy entrust to Ralph?

Answer 1

The 'secret' which Piggy entrusted to Ralph was that at school he had been nicknamed Piggy. Once he tells Ralph and Ralph later reveals this to the rest of the boys the nickname is used whenever he is referred to and his real name is never actually revealed.

Answer 2

Piggy tells Ralph to blow the conch long and loud as they arrive at Castle Rock. It is an ineffective action because both boys know that none of the painted savages will follow Ralph anymore...

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Answer 3

If it's early in the story, then take names of the littluns.