Your search for "raspberry pi 4" revealed the following:
LeoStick (Arduino Compatible)
Regular price $26.00The LeoStick is designed to be functionally similar to the Arduino Leonardo, but given the "honey, I shrunk the kids"...
Adafruit DRV2605L Haptic Motor Controller
Regular price $13.52The DRV2605 from TI is a fancy little motor driver. Rather than controlling a stepper motor or DC motor, its...