Media-savvy ones are hard to come by. There's Potholer who knows the subject but isn't a climate scientist himself: https://www.youtube.com/@potholer54/videos

Or Roshan D'Arcy who has an Msc in Climate Change and is a 'PhD researcher studying the communication of climate change in modern media': https://www.youtube.com/@AllAboutClimate

Otherwise James Hansen is a high profile climatologist who was one of the first to go public with warnings of the effects of climate change: https://en.wikipedia.org/wiki/James_Hansen

The trouble is, you need someone who's familiar with the politics of the denial movement and able to effectively debunk the claims, otherwise they just spray them out loudly and confidently and it makes it appear to a lay person that there is still a meaningful debate to be had about the fact of the matter, which there ain't.

cheers,
I