In Tropeognathus certainly not

Probably not. Also, I'm not completely sure if they were actual "teeth".

Depends what you mean with teeth

Some of them are just pointy jagged beaks and wouldn’t need any moisture like teeth do.

The ones with true teeth would likely have lips if they don’t have any lifestyle that revolves around water

Like Rhamphorhychus is a fish eater with gnarly teeth. Because it spent so much time in the water it likely has no need for lips

^^^How do you know? Was there a study about that?

Why would keratin cover such long and laterally extending teeth? That would make then practically useless

The filter feeding pterosaurs like Pteraustro most definitely didn't have lips

Pterosaurs with lips are cursed