So, you're playing "hide & seek" with your baby corn snake? They're really good at this but don't give up...as others already mentioned, they tend to
survive better than you might imagine. You might leave out a bowl of water to help though...creatures (including us) can survive longer without food
than without water. Please work on making your cages escape-proof...that's super important. (you don't want to do this again, I'm sure)

You asked about your ball python too: tongue-flicking is normal...snakes do it all the time...their sense of smell is very accurate & their best sense to
know what's going on, not only for finding food, but that's obviously a big motivator for sure. It's not likely that your BP's tongue flicking is at all related
to your missing corn snake...your BP would have very little interest in him.

As far as your snake (BP) being in shed & yawning, that's something many snakes do before they shed: it serves to loosen the skin around their jaws,
which is where they begin to "undress". After your snake sheds, always verify that they got all the old skin off: the places that tend to get stuck are
the tail tip, the eye caps, and their lower jaw. Old skin that remains in place can cause problems- for example, several sheds left on their tail tip can cut
off the circulation & cause the tail tip tissue to die.

Welcome to the forum...I hope you find your 'baby' soon & in good shape. Do let us know?