No, there isn't any reptile I know of that they are safe or useful for. The biggest problem with them is since the reptile lays directly on them, burns are a major risk if they short out. Plus, they can't provide a proper heat gradient. The heat from them stays on the rock, and doesn't spread out in any other parts of the cage, so the poor reptile ends up clinging to the heat rock most of the time since it has no where else to go for warmth. They are one of the stupidest things that the reptile industry ever came up with.
They make great paperweights. Or cut the cord and use it as a cage decoration. Not much else.
It's the same reason why cedar shavings are still sold as small animal bedding. Or that dry crud in a jar is sold as tortoise food. The industry will try to sell anything they think they can make money on, and many people simply don't know any better.