Forum:Swap Frog Q

Okay, let's say I have a Swap Frog and a Treeborn Frog on the field. I tribute my Treeborn Frog for a Caius the Shadow Monarch, and his effect starts a chain. Therefore it would be chain link 1. My opponent responds by activating Bottomless Trap Hole as a Chain Link 2. Is it possible for me to activate Swap Frog's effect to return 1 monster I control to allow me have an extra normal summon in response to my opponents Bottomless Trap Hole? My target would be to return Caius the Shadow Monarch to hand, and since it's a cost to activate, I would be able to right?