"It'll build character!"
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The planet closest to Star X-351 is a planet in the Spaceman Spiff universe. Spiff most likely stranded himself on the planet, as he was unable to name it and is quoted as saying he "finds himself" on the planet.
The planet contains several Zogwargs, who have built a military spaceport on the planet. It is probably a strategic outpost for the Zogwarg empire.
Much like Planet Zokk, the planet closest to Star X-351 has low gravity, allowing Spiff to make huge bounds. Spiff described the light from its sun as "blinding", due to being the closest planet to Star X-351. That and the rugged topography indicate that it must be a desert planet.