I was watching a Mark Rober video in which he shows a prototype of his robot, does anyone know what the board in the attached screen-grab is?
I think I found what you're looking for here on Amazon, called "DC Brush Motor Controller, DROK 16A Dual Channel H Bridge Motor Driver Brushed Board DC 5V-36V Motor Drive Control Smart Car PWM Speed Regulator"
I found it by looking at the board in your picture. I counted what appears to be eight beefy-looking transistors, and you mentioned it's for a robot so I assumed they were setup for two H-bridge circuits. Then the connectors on the end look like servo connectors, which are typically PWM, so I googled "Dual H-bridge board with PWM drivers" and found a version online.
Hope this helps! Looks like fun :)