Beige bottom right definitely is. The black back one is interesting. Would need a closer look and a good image of the claws. There are some mithrax/mithrax-like crabs with different patterns than the emerald/ruby crabs. The upper left one is potentially a juvenile porcelain crab, because I only see 3 legs on either side, not 4 legs like true crabs. Hard to tell in the photo. If a porcelain, then that's a keeper for sure.