The Pralor homeworld was a planet in the Delta Quadrant and the homeworld of the Pralor, which were driven to extinction by Automated Personnel Units some time before 2372. (VOY: "Prototype")

This planet was only mentioned in dialogue.
According to Star Trek: Star Charts (p. 84), there was a star system named Pralor, which might possibly be where this planet was located in, in the quadrant. This was a trinary system with a G-class star, a M-class star, and a K-class star. The USS Voyager visited this system on stardate 49240.
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