I don't recommend it. Those are designed more for juice-based popsicles where you can run them under some water to remove them from the molds. You don't want to warm up the outer layers of your ice cream pops or they'll end up softening too much and you'll end up with drips of melty ice cream contaminating your chocolate shell. The stretchy silicone flat-lay molds are much easier, I promise. That said, if you can find stretchy silicone upright molds, go right ahead and use those.