pepo

kurkku, meloni, kurpitsa (no single word covering all)

kurkkukasvi A fruit of plants of the gourd family Cucurbitaceae, possessing a hard rind and producing many seeds in a single, central, pulpy chamber.
A plant producing such a fruit.
1945, George Francis Carter, Plant Geography and Culture History in the American Southwest, Issue 5‎, page 25

The Papago claim that their ancient pepo would produce a mature, sweet melon if the ground were wet only once, while the "new" melons would not.