A 4 nm thin transition-metal dichalcogenide (TMD) body FinFET with back gate control is proposed and demonstrated for the first time. The TMD FinFET channel is deposited by CVD. Hydrogen plasma treatment of TMD is employed to lower the series resistance for the first time. The 2 nm thin back gate oxide enables 0.5 V of Vth shift with 1.2 V change in back bias for correcting device variations and dynamically configuring a device as a high performance or low leakage device. TMD can potentially provide sub-nm thin monolayer body needed for 2 nm node FinFET.