Frogs breathe through their skin as well as their lungs.

While it's true that some frog species can breathe through their skin, the assertion that frogs breathe exclusively through their skin and lungs is not accurate for all frog species. Frogs have a unique respiratory system that allows them to obtain oxygen through various means.

Lungs: Like many other vertebrates, frogs do possess lungs that enable them to breathe air. The lungs of frogs are relatively simple compared to those of mammals, but they play a crucial role in respiration.

Skin: Some frog species have permeable skin that allows them to exchange gases, such as oxygen and carbon dioxide, directly through their skin. This process is known as cutaneous respiration. This ability is especially significant for frogs living in environments with limited access to oxygen, such as aquatic habitats with stagnant or low-oxygen water.

Buccal Pumping: Another method of respiration in frogs involves buccal pumping, where they force air into their lungs by using their throat and mouth muscles. This is often seen in terrestrial frogs and some semi-aquatic species.

Gills: During their early life stages, many frog species start out with gills. These gills allow them to respire underwater, and as they undergo metamorphosis into adulthood, they develop lungs and often acquire the ability to respire through their skin.

So, while the degree to which a frog relies on skin respiration varies depending on the species and their environment, it's not accurate to say that all frogs exclusively breathe through their skin and lungs. Instead, different frog species have adapted various combinations of these respiration methods based on their habitat and developmental stage.