Yeah, the Crisco candle is a good one, and seems like it would work.
I'd need to see the pop-top fishhooks in action before I'd believe their efficacy. A finely machine-honed fishhook doesn't guarantee a hookset, and even slightly dulled, your odds of penetration go way down.
I just don't see a way in a dire-straits scenario to cut a pop-top and sharpen it to the degree necessary to be an effective tool that would provide any measure of success.