Ipu is the Hawaiian word for the gourd (Langenaria sacraria). The early Polynesians brought the seeds to Hawaii and also used the hollowed out gourds on the voyage, for storing water, food, and other items, and to bail out the canoes.
These days, the gourds are used to make musical instruments that are used in dances and in chants. The plant is a climbing vine and the gourds are the fruit of this vine.
Graham's Island 
Edible? like a watermelon?
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They’re from the same family as watermelon and I believe they’re edible, but everything I’ve read has more to do with the use and decoration of the gourds.
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That is a recommendation not to eat. Like the little Bush Melons here. More useful in hand to hand combat that eating
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