water chestnut: a plant of the genus Trapa bearing spiny four-pronged edible nutlike fruits
aquatic plant: a plant that grows partly or wholly in water whether rooted in the mud, as a lotus, or floating without anchorage, as the water hyacinth
common iguana: large herbivorous tropical American arboreal lizards with a spiny crest along the back; used as human food in Central America and South America