Can I use an icloud locked iPhone 5 screen (digitizer & lcd) on another iPhone 5?

I messed my iPhone 5s digitizer and LCD up. And the cost of a whole new one is pretty high costing more than $50. I could just buy an icloud locked iPhone 5 and have all the parts for the same price.

Sure can

It should work, although receiving stolen goods is a felony in most jurisdictions.

Should be able to. Since you would effectively be using it for its parts