Is there any plausible in-between of Endotherms and Ectotherms?

Someone in the comment section of my previous question pointed out the energetic problem of ectotherms with human intelligence (the brain needs a lot of energy). I still want to keep my lizardfolk restricted to warmer climates, as all the other suggestions just didn't work (lizardfolk don't have blood feuds, they aren't toads, and they have a more "human" respiratory system; all of that leaves Clint's Reptiles' endless list of things that Asian water monitors need and the kinds of diseases they can get as the best reason of them remaining in the background).

I thought maybe an in-between of ectothermic and endothermic temperature regulation would be a good way to have the cake and eat it (one half-gone, one remaining, balanced, as all things should be).

The question is if such in-between is possible and if yes, how could it work?

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Is there any plausible in-between of Endotherms and Ectotherms?

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