General terms:
* Grove: This is a common term for a small group of trees, often with a specific type of tree (e.g., an oak grove).
* Wood: This term is often used in Britain and other areas for a small, often wooded area.
* Copse: This term usually refers to a small area of dense, deciduous trees.
* Thicket: Similar to a copse, this implies a dense, often tangled area of trees and shrubs.
More specific terms:
* Woodland: This can be used for a small forest, but it can also encompass a larger area.
* Spinney: This is a term used in Britain for a small, secluded area of trees, often with dense undergrowth.
Ultimately, the best term to use depends on the specific context and the characteristics of the small forest.