I would definitely not use a crochet hammock. Legs could easily slip through, get caught, and end up broken. Plus, the only really "approved" material for hammocks is polar fleece. If they chew it up (some don't, some do) it doesn't turn into a bazillion little threads that could harm your chin.
Hi and welcome! Thank you for asking about the hammock. We are happy to answer any questions you may have as you are learning about how to care for your new chin!