They all seems to be lacking the presence of nose, making them look like skulls with fins on the top of their heads or sometimes on their cheeks.
The most prominent member of this race is Sūi who got defeated by Gohan after he blasted Nameless Namek's Spaceship and destroyed it shortly after the Dragon Team landed on Namek. He was sent to check whether the Earthlings poses a threat by Zarbon's order along with Banan.
Many of this race had been seen working under Frieza by the time of the events depicted on Dragon Ball Z: Bardock - The Father of Goku, and many of them died during the Genocide of the Saiyans by Frieza.
A yellow member of this race appears with the rest of Frieza's army remnants outside Frieza's Spaceship when Captain Ginyu is running the Ginyu Force's new member tryouts. Just before taking off Ginyu ordered a group of soldiers (including this yellow member) to burry and hide the Namekian Dragon Balls.
Members of this race also appears as serving under Sorbet and later accompanying the newly revived Frieza as part of his 1000 soldiers Frieza Force to Earth where they're easily defeated by the Dragon Team.
In Dragon Ball Super, there is a member of this race who is a part of Guarana's Crew and is the first character to witness a Super Dragon Ball before being killed by Champa's Wrath of the God of Destruction.