Robo-lizards are a type of Robot made by Viceroy for McFist, with the purpose of collecting the snot of others, so McFist could check the DNA in comparison to the DNA from the Ninja he had captured. And was the villain in the episode "House of a 1,000 Boogers"
Randy first chased on across a roof, he almost destroyed it, but the thing sprayed a type of mist that made him sneeze, and caught his snot, it then vanished. Later at Bash's birthday it appeared again and did the same trick on him again, this time only as Randy. He chased after it and found it delivering the Snot to McFist, when Randy faced agaist them, Viceroy called several others, Randy managed to destroy several of them, before flooding the house destroyed the rest.