This could take a variety of forms:
Create a discussion prompt in google classroom by click Create > Question
Learn how to turn your discussion forum into group projects
https://www.youtube.com/watch?v=CyMJ92CrIC4
Have kids record their own videos and respond to each other
https://www.youtube.com/watch?v=vJOoloQ7k5Q
.
Various ideas for setting up a variety of online group activities
https://sites.google.com/nyu.edu/nyu-steinhardt-toolkit/instructional-activities/zoom-activities/group-work?authuser=0