After creating an insect clone, Shino and the clone run towards the opponent and simply tackle them. The force of this attack is strong enough to send the target flying away from them.
Though different due to the use of clones, the Iron Mountain Leaning is a taijutsu move that is a technique commonly used in Chinese martial arts, mainly derived from Bajiquan/Hakkyokuken (lit. Eight Extremes Fist) and is pronounced as the Tieshankao ("Tee-uh-shah-n-kah-oh") in pinyin. The attack through its Japanese reading is often adapted into video games and is often portrayed as a turning back/shoulder-lean through explosive force. More info can be seen about it here.
However, the Tetsuzankō itself is derived off of the Tieshankao/Tenzankō (貼山靠, lit. Applying Mountain Lean) through the first character being changed.