* The name is misspelled: Perhaps you're thinking of a different artist with a similar name.
* The artist is lesser-known: There could be many artists named Peter Frost, but they might not be well-known enough to have a defined art historical classification.
* The artist is contemporary: If the artist is still actively creating, their style may be evolving and not yet fully categorized.
To help me pinpoint the artist and their style, could you provide more context?
For example:
* Do you have any more details about Peter Frost? Like their nationality, period they worked in, or any specific artworks they are known for?
* Where did you encounter the name "Peter Frost"? Was it in an art book, website, or other source?
With more information, I can help you figure out the art school or movement associated with Peter Frost.