What is the homograph for He sang out in his low voice when he caught fish?

The homograph for "He sang out in his low voice when he caught fish" is "He sang out in his low voice when he caught _fiss_."

A homograph is a word that has the same spelling as another word, but a different meaning and pronunciation. In this case, "caught fish" is replaced with "caught fiss." "Fiss" is a word that means "to split or crack," and is pronounced differently from "fish."

This is a humorous example of a homograph, as it uses a word that sounds like the original but has a completely different meaning.