A tundra, by definition, is a treeless zone in the far northern reaches with a subsoil that is permanently frozen. It's doubtful that when Toyota named its full-size pickup truck it had any sort of negative connotation in mind. But the 2013 Toyota Tundra is starting to take on some of its namesake's attributes. On the surface, the Toyota Tundra has seen some growth throughout the seasons, but underneath it has remained largely unchanged since the current model debuted six years ago: frozen solid, if you will. Meanwhile, the Tundra's competitors from Ford and Ram have evolved and adapted to the shifting automotive landscape.