Place of origin:
Whifferdill were a shape-changing species from the planet Xenon. (Voyager) Their real form was a humanoid, pale yellow in colour with a round, featureless head.
A Whifferdill’s shape-changing abilities could be impaired if they were infected with mono-morphia. (Genesis!) They were related to Kymbra Chimeras, another shape-shifting species. (Changes)