No the far lest a probe as landed was Saturn
No space missions have landed on Neptune or flown by it. The only spacecraft that has visited Neptune is Voyager 2, which conducted a flyby of the planet in 1989. There are no current plans for future missions to Neptune.
Only one spacecraft has visited Neptune: NASA's Voyager 2 probe, which made a flyby of the planet in August 1989. Voyager 2 provided our first close-up images and scientific data of Neptune and its moons.
The answer depends on "before what".
probes
No spacecraft from Earth has ever landed on Neptune.
You cant land on a gas giant But probes have gone "inside" gas giants
Semi-autonomous space probes have gone to the vicinity of Neptune, but no robots in the popular sense.
nowone has ever traveled to Neptune only probes
No - there is no surface to land on.
the mars rover
Huygens
viking 1