Futomomo 太腿
Japanese for thigh; futomomo shibari is a tie that holds a bent leg folded, with the calf or ankle bound to the thigh, also called a frog tie.
Futomomo (太腿, also written 太もも) is the Japanese word for the thick upper part of the leg above the knee, the thigh. In rope, futomomo shibari names a tie on a bent leg: Shibari Study describes it as securing the ankle to the thigh and stresses that the name simply means tying a bent leg rather than one fixed pattern. Rope365 files it under the English name frog tie, a tie that keeps the leg folded by joining calf and thigh, and English Wikipedia lists it as a calf-to-thigh leg tie.