Why is a frog called a cold-blooded animal?

Cold-blooded animals:

1. These are animals whose body temperature does not change with the surrounding temperature.
2. They can either be terrestrial or aquatic.
3. Pisces, amphibians, and reptilia group are under cold-blooded.
4. Frogs are cold-blooded which means they change their body temperature according to their surrounding.
5. When the temperature around them is cold, they lay in the sun and when they get too warm they go into the water to cool down.