My new oak transplant has turned yellow and is dying…what’s wrong?

Question

Termites? Overwater?

Answer 1

If these are new plantings and they are showing stress along with yellowing leaves; it is likely a watering issue.
A consistent watering regimen is needed immediately following planting in order to ensure that your new tree remains healthy and adapts to it's new location.
These articles will help you.

https://www.gardeningknowhow.com/ornamental/trees/tgen/watering-newly-planted-tree.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/what-is-well-drained-garden-soil.htm
https://www.gardeningknowhow.com/ornamental/trees/oak/how-to-grow-an-oak-tree.htm