WiFi Guard does not protect you from MITM or Evil Twin. I don't know any software that would, it's a rather complex issue that cannot be simply dealt with by the means of an app.
Having said that, if you see two WiFi networks with the same name, it most likely means that your router is dual-band. Dual-band routers broadcast the same network name at two frequencies: 2.4 Ghz (older and slower standard but compatible with more devices) and 5 Ghz (newer and faster standard). You can check your router's settings to make sure that's the case, and if so, you can connect to either network safely.