Alright, I know this is a long shot in the dark, but it was a game, i remember these weird frogish things, you started, and you could use a gun, or melee. The gun was fps aiming and stuff, the npcs were pretty dumb if you used a gun, they would get stuck on things and you could just shoot them. I know not much to go on, it was a long time ago, and i found it on this website.