The question makes no sense.
No they couldn't, evolution like this never occurred. Reptiles have always been reptiles.
No, they did not.
Reptiles have scales and Amphibians do not.
Amphibians do not have scales; reptiles do.
No. Birds and reptiles are separate from amphibians.
Reptiles evolved from labyrinthodont amphibians around 315 million years ago. Hence all amniotes (reptiles, birds, and mammals) descend from the labyrinthodonts.
No. Reptiles and amphibians are two different orders and animals and amphibians cam first. Simply put, the first amphibians evolved from fish and the first reptiles evolved from amphibians.
amphibians
amphibians
Snakes are "Reptiles" not to be confused with "Amphibians"
Herpetology is the study of the role of amphibians and reptiles.
Fish, and then amphibians, and then reptiles, and then mammals