Popp would like to call his reaction enthusiastically and sensibly concerned. Why would you want to go to Snake Island, why would anyone. Why does the trolley even GO here...

"Yeah, sure, maybe it's just the shape. Or the snakes are... friendly? Dermaline Island was perfectly fine, Sabercats and all!"

He's trying to convince himself of this. It feels that a place with a significant name has that name for a reason, like the Field of Death, and the region on the map he's squinting at dubiously sure doesn't look snake-shaped.

"...Maybe it's a snake coiled up, like how I used to sleep in dragon form."