So far she has not been mentioned, so chances are she will not return.
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The villain for the season finale has not been revealed. It could be one of them, or it could be someone new.
No
No information has been revealed as to who the villain will be.
There is no known backstory for Queen Chrysalis as of yet, and it has not been confirmed if she was or wasn't Princess Papillon. Princess Papillion appears to have been a fan-made version of Chrysalis and so is not a cannon character. It is unlikely that Chrysalis has any connection with the Rainbow Kingdom.
The Return of the Frog was created in 1938.
spring season
"Queen Paul Rodgers-Return of the Champions(Marketed in India by which Label?""Queen Paul Rodgers-Return of the Champions(Marketed in India by which Label?"
Little Queen was created in 1976.
summer
The Queen of Hearts bakes some tarts in the nursery rhyme "The Queen of Hearts," which is not typically associated with a specific season.
spring