Trees that are called Tengu trees are mostly big trees with widespread branches and trees with an extremely strange shape such as one branched into two and put back together having a window-like shape, or one with a branch in the shape of a bump.
天狗の木と呼ばれる樹木は枝の広がった大木や、二枝に岐れまた合わさって窓形になったもの、枝がコブの形をしたものなど、著しく異形の木が多い。