What kind of legs makes an insect kosher?
Yet these may ye eat of all winged swarming things that go upon all fours, which have jointed legs above their feet, wherewith to leap upon the earth; Lev 11
So knees higher than their feet, jumpy legs. And I suppose they have to swarm. And most rabbis would only permit 4 particular species of desert locust. There are no dessert locusts. Crickets aren’t kosher.