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Involuntary Shapeshifting is defined as:

• Character posesses some manner of Shape Shifting ability.
• Character is unable to control when and where their transformations occur.
• Their transformations are a recurring event within the series.

However, it is frequently potholed as a Stock Phrase for any and all forms of transformations being forced upon an unwilling subject, regardless of whether it's a character ability and/or a recurring event. We already have tropes for that — Baleful Polymorph, Transformation Ray, Fisher Kingdom, Mode Lock, Karmic Transformation, etc.

Stratadrake did a rough cleanup of the wicks and documented approximately 50% misuse of the trope in related articles.