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it's possible, but unlikely. you would see a large lump where the body of the fish is, inside the plate. just touch the plate so it retracts it's tentacles and see if you can see a bulge right under the mouth area.
Your remaining clown does not require a mate. If you decide to get one, make sure you get one that is smaller. Was this one the larger or smaller of the pair?
You may want to consider some netting or eggcrate for the top of the tank.
It's always sad when they carpet surf. I've had a couple of fish do that.