Hello Kristin Chadwick,
Yes, absolutely, there are plenty. How lucky are you to have two dream clients.
You can loop the resistance bands around each other so each has a pair of handles to hold on to. You can also use the band with one person holding the handles and the other holding the center of the resistance, but, this way, you can only use one strength.
Push ups with a high five while facing each other. The same for other prone exercises.
Ball passes while back to back, standing and seated.
Squats holding hands to really lean into the glute squat.
Have fun using your imagination.