noun
face-in-the-hole board; photo stand-in board
A flat board with a hole for a person's face, often with a painted body or scene, used for taking souvenir photos at tourist spots.
観光地で顔ハメ看板を見つけて、友達と写真を撮った。
I found a face-in-the-hole board at the tourist spot and took a photo with my friend.
Compound of 顔 (face), ハメ (from 嵌める, to fit into), and 看板 (signboard). The term describes a signboard with a face-shaped hole for photo opportunities.