Mochtroids are the "cousins" of Metroids. These creatures are the result of failed Space Pirate experiments to clone a Metroid. Mochtroids are significantly weaker than Metroids, for the fact that their membrane is flaccid to the point of collapsing on contact. They also have fewer internal nuclei, limiting their thought capacity to simply searching for food. This type of enemy was only encountered in a sub-aquatic Space Pirate outpost in Maridia, in Super Metroid. They can drain life energy but can't latch on to prey.
Hologram Mochtroids, or something similar, are in the Regulator and Survivor training modes of Metroid Prime Hunters: First Hunt.
Their name may come from the fact that they are "mock Metroids" ("mock" as in an imitation)