These guys are the oddballs in the Ceratophrys cranwelli family. In order to be considered a mutant, the following 2 criteria must be met:

1) Have unique colors that are not observed on normal Cranwelli

2) Change colors more frequently and aggressively than normal Cranwelli


Note: We can not guarantee how their expressions turn out for the reasons above. 

There are always exceptions to the rules above. Sometimes a mutant can have unique expressions but doesn't change as frequently as others. 

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