Old cocoyam: Colocasia esculenta; taro.
New cocoyam: Xanthosoma, particularly Xanthosoma sagittifolium, or the edible root of that plant; malanga.
Chinese taro (Alocasia cucullata, syn. Caladium colocasia).
Taro (Colocasia esculenta)
Any of several Central and South American plants, of the genus Xanthosoma; yautia.
The edible tuber of these plants, some of which have medicinal value.