Alex will probably look curiously at the Shell when it's visible but will not try to mess with it. He won't narc if someone says they want to, though.

The food after he eats or trades for enough to keep himself from going hungry will be shared freely with the crew, probably favoring the kids since it can be broken up into smaller portions to go further that way. He will do his best to keep the children from sharing their food with the clingy church griffin who'll be around for that and giving everyone Starving Birdcat Face.

He will agree there should be a hatchling representative at the meeting but has no preference to who beyond "not me."

As for questions I'd like to know if there's anything Alex would be able to tell about the Thessyx as a herpetologist who's been around cold-blooded humanoid species before that his fellow endotherms might miss. (IE, would familiarity with for isntance these or this species give him some comparative context or insight?)
Also, will they be offended that he's basically in perma-study mode and trying to be awkwardly polite about it, but in the end is just kind of nerding over an entirely amphibious society?
Apologies for editing but also what could he learn about the critters via dissection and how do the Thessyx seem to think of them?