Why does a frog does not show cephalization?

Frogs do not show cephalization because they have a relatively simple nervous system compared to more complex organisms. Cephalization is the evolutionary development of a head region with sensory organs and a centralized brain, which allows for more complex behaviors and responses to stimuli. Frogs have a decentralized nervous system with ganglia located throughout their body, rather than a centralized brain in the head region. This simpler nervous system is sufficient for their basic survival needs and behaviors, such as hunting for food and avoiding predators.