Final answer:
Frogs and toads are classified under the order Anura, which is distinct from the reptilian orders Squamata, Testudines, and Crocodylia. Anura includes species with a wide range of sizes and adaptations, such as jumping, camouflage, and sometimes poisonous skin.
Step-by-step explanation:
Frogs belong to the order Anura, a group of amphibians commonly referred to as 'jumpers' due to their specialized body plan for movement. This diverse order includes a wide range of species, such as the minute New Guinea frog and the large goliath frog from tropical Africa. Frogs are known for their powerful hind limbs, used for jumping to catch prey, and their skin acts as camouflage and can sometimes be poisonous to predators due to defensive chemicals. They can also exhibit aposematic coloration to ward off potential threats. Frogs and toads are closely related within the Anura order, with frogs usually having longer legs and smoother skin compared to the shorter limbs and warty skin of toads.
In contrast to Anura, the order Squamata includes reptiles like lizards and snakes, whereas Testudines comprises turtles and tortoises. Crocodylia includes alligators and crocodiles and is notable for being the closest living relatives of birds, sharing a common ancestry with dinosaurs.