To identify it, I would need to see a photo and also know where it is from. There are several species of smasher that are green or that have a green color morph. There is even one that is named for the color green, Gonodactylellus viridis from the Western Pacific.
As for jumping, they can occasionally jump, particularly when spooked. Most gonodactylids can only about a body length out of the warter, but some small Odontodactylus can clear 6 inches or more.
Roy