The average lifespan of horned frogs (Ceratophrys Ornata) in the wild can be anywhere from 1 – 4 years. But with proper care and attention in captivity – and as pets – they’re capable of staying on for 10 years and even more. Horned frogs come in different shapes and sizes. The captive-bred baby Pacman is traded at about the size of a quarter. From there they can grow to adult size in about 1 – 1½ years. While female Pacmans can grow in size, reaching between 4 – 7 inches at adult stage, adult males crawl behind at a mere 2½ – 4 inches long).