Can I eat this squash?

I have been given a mystery squash, and I'm not even sure if it's good to eat.  I'm hoping someone here might know ..

May suggestion would be to cook it and if it is bitter throw it away.

There are toxic squashes, the toxin in them is cucurbitacin, which is bitter. Therefore, if you get a squash, pumpkin, zucchini, ... which is bitter, don't eat it, you might die.

The toxin can be tasted even in the raw stage, I taste test them before even trying to cook them.

One caveat: some people do not have the taste receptors for bitterness. They are more at risk of cucurbitacin poisoning, as they do not notice the toxin.

Testing for existence of bitter receptors. Grab a handful of dandelion leaves. Better yet, a handful of wild lettuce leaves. Stuff them in your mouth, chew with enthusiasm. Did you make a face? Does it taste bitter? Cool! Now you know you have the receptors.