Cactops are created through some sort of anomaly, where the genes of Fubadubian cactus plants are mixed with those of an unknown desert animal, most likely one that spends it's entire life underground. The result is a huge, green, spiky beast who can trample a Fubadub flat. The Camaki have no way of controlling when a cactops will be created, other than planting many cactus gardens throughout their homeland.
Cactops bear a striking resemblance to an ancient Fubadubian reptile known as the Kloggtops. Therefore, it is possible that the unknown burrowing animal that mixes with cactus plants to create cactops is a descendant of the Kloggtops.