Here is the very beginning of an illustration of Green Striped Cushaw Squash for SESE:
Anyway, I was curious about this funny word, cushaw. So, I looked it up and found not much. Dictionary.com has this to say about it origins, "1580-90 Americanism ; origin obscure; alleged AmerInd, etymologies unsubstantiated". And wikipedia has nothing at all to say about it. So I guess it will forever be a funny little word mystery.