Cute Young Brunette Girl At The Lake With An Old Tree Branch

Specific terms
A bough can also be called a limb or arm, and though these are arguably metaphors, both are widely accepted synonyms for bough.
A crotch is an area where a trunk splits into two or more boughs.
A twig is frequently referred to as a sprig as well, especially when it has been plucked. Other words for twig include branchlet, spray, and surcle, as well as the technical terms surculus and ramulus.