An ectothermal cold blooded animal is
Ectothermic also called cold-blooded animal, that is, any animal whose regulation of body temperature depends on external sources, such as sunlight or a heated rock surface.
A. Penguin- Endothermic Warm blooded.
B. Lemur- Endothermic Warm blooded.
C. Owl- Endothermic Warm blooded.
D. Frog- Ectothermic Cold blooded.
So, the correct answer is 'Frog'.