In IOT (Internet Of Things) applications development, FPGA development board can be used? Mostly embedded based kit used in IOT development. How to differentiate Embedded based and FPGA based development board?
FPGAs alone do not support full Internet Protocol stacks. It takes a ridiculous amount of effort just to implement UDP with a vendor-supplied MAC layer. You can get suitably low power FPGAs from a number of vendors, e.g. IGLOO from Microsemi, but you will need a microcontroller for the Internet Protocol. Lots of people are currently using a T.I. part. I can find out the part number next week, I do not remember it offhand. You'll probably need a low power wireless network as well, which the T.I. part supports.
To answer your first question: you can implement a System On Programmable Chip (SOPC) on FPGAs, it's a system generally based on Processor cores (IPs) Like NiosII processor (Altera) or MicroBlaze processor (Xilinx) along with other IPs like Ethernet cores, GIOP, Timers, UART, etc...
For your case, Ethernet Soft Core can take lots of time to be developed , but there is a few open source Ethernet Soft Cores along with their drivers see ( Altera University Program Or OpenCores website) if you want to use an RTOS with TCP/IP Stack.
Bottom Line it's Possible to use FPGAs for your project but you need
1 - Altera QuartusII Design Suite (Qsys and NiosII EDS)
Or
2 - Xilinx ISE Design Suite (Xilinx's Embedded Development Kit )
So basically you need to create an SOPC (CPU, IOP, Timers, Ethernet IP, LCD IP, etc...) and chose an RTOS (FreeRTOS, MicroC/OSII RTOS, etc...) for the used CPU and you should be Able to do it.