From the West Indian name chachaSee description for Sechium edule.

Mature fruits.

Hard green pear-shaped fruits.

1 species from tropical America.

Source: Spencer, R. (1997). Cucurbitaceae. In: Spencer, R.. Horticultural Flora of South-eastern Australia. Volume 2. Flowering plants. Dicotyledons. Part 1. The identification of garden and cultivated plants. University of New South Wales Press.