We have them here in Central NJ as well. Usually in the spring. Like you, I think an entire family moved in this past year. We've had a couple for the last 3-4 years but this year - yikes! Ours live among the akibia vine that is everywhere around our pool/deck and mostly hang out on the lip of our above ground pool. For winter, we just let our pool go - not winterizing and just drain; clean and refill in the early summer. Well, this year after seeing about a half dozen or so tree frogs, I happened to glance in the dirty pool one day. There were a bazillion tadpoles in the pool! After some online research I discovered that each tree frog can have up to several thousand - yes, thousand - tadpoles! Well, I think every one of those half dozen or so adults had all several thousand of those little buggers! DH put several leaf skimmers worth of tadpoles into the creek at the back of the property before 'doing' the pool this year. I don't even want to think about what will happen next spring!
And yes, according to my vet-tech sister, they do taste nasty! One of my concerns if all those tadpoles grew up was that I was going to be wading calf deep in tree frogs in the back yard because the dogs won't bother them. She said snakes & large birds are their predators. Well, with 2 dogs in/out of the back yard, no snakes/birds to snack on the frogs. But they are the cutest little things with such giant voices. Love 'em.