It isn't necessarily a mutation, which must be a genetic change that can be inherited. This is more likely a developmental accident. Building a flower from scratch is a complicated process, and it doesn't always go perfectly. Sometimes environmental stress to the plant early in bud development can contribute, but sometimes it just happens. Extra flower parts or 2 flowers partly fused is a fairly common occurrence, but this is an especially dramatic example. There is no particular name for it.
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