They most certainly can jump!!! As Lija mentioned, it varies depending on the size of the frog and the species (Joaz tend to have longer, power legs and are JUMPERS!) but never underestimate them! They may be "sit and wait" preditors, but they are built to make long lunges at prey. I've had babies jump out of Kritter keepers and adults jump out of ten gallons. They all try to jump out of their baths. They are very athletic in small spurts. Just because they haven't tried to jump out before, doesn't mean they won't suddenly decide to try. And it most likely will be when you least expect it.