I know it might be hard due to the FTDI chip, but is it possible?
You mean this board? https://learn.sparkfun.com/tutorials/using-the-sparkfun-picoboard-and-scratch/all They are not sold anymore.
It was used with Scratch 1.4 desktop version. I have one that is yellow.
Do you have a picoboard? If not it would be easier to use a board like the microbit, calliope or something else that is programmed with MicroBlocks.
I have got one, and I wonder what you could do with Snap! using it. It is simply an input device, which is why it could be used to control other things like an Arduino.