Not sure re cheese- definitely a stronger flavor than mozzarella. If I
have to guess I'd say fontina and cheddar.

I actually ate the poppers as an appetizer before the wine. But I'd go
for a crisp white to cut through the frying. You know, most jalapeno's
these days just aren't that hot- these weren't- and the cheese mutes
what heat there is. Try a Gruner!