I doubt it:
-The way Crabrawler Thorax and head looks is really similar to the coconut crab shape and not a mantis shrimp one.
-The fact that is only fighting type and not fighting/water, coconut crabs are terrestrial crustaceans, they drown if they stay in water for too long, while mantis shrimps are marine crustaceans.
Still it could be based on both.