I'm not familiar with air dry clay, but in general cold is going to make things more brittle.
Also, this isn't related to your question but I'll drop it in. If you can sling close to home, you should get some spherical ice molds. You can look around, but something like this:
https://www.amazon.com/VARWANEO-Silicone-Whiskey-Cocktail-bourbon/dp/B08DNN1BBR. They're great projectiles, and you don't have to go gather them up after you throw them. Their biggest limitation is they melt, but that's more of a summer problem.
There are round though, so if you're a big fan of the glande shape you may not want something spherical.