CAN ports on STM32F407G board
Yes, a lot of STM32s have multiple CAN ports, and you can check by downloading a tool, STM Cube (see link).

A ...G does not exist, but VG does. See here more information:

Info

It shows:

◾2 × CAN interfaces (2.0B Active)

This table shows which other STM32s have two CAN buses.