GHIElectronics.TinyClr.Pins, there is no
FEZ.UartPort.Usart2 but only
FEZ.UartPort.Usart1. Is it intentional ?
It’s intentional because it’s not exposed on any of the supported areas of the board (though you probably noticed the holes near the crystal). Additionally, its CTS and RTS pins are used for other functions elsewhere.
You can of course use the underlying
STM32F4.UartPort.Usart2 if needed.