An interesting article “proving” most dinosaurs were warm blooded and that Troodon may have been able to switch back and forth to cold bloodedness.
https://www.discovermagazine.com/planet-earth/fossil-eggshells-suggest-all-dinosaurs-may-have-been-warm-blooded
https://news.yale.edu/2020/02/14/were-dinosaurs-warm-blooded-their-eggshells-say-yes