Mucky, I tend to agree with Haro. I've seen my leopard frogs easily jump 24" in one stride. The bullfrogs go a long ways, too. There was a time that one jumped from the near side of the koi pond to over halfway across it before it hit the water, and at that point, it's 8' across. I know that sounds unreal, but those legs are made for jumping. I think your frogs are hoping you will feed them before you put them back in the pond. Plus, they are likely finding bugs on your patio during the night, so might be a good thing to let them stay out all night. And, if there are none there in the a.m. .... maybe they jumped back.
But, I would be with you and return them to the pond if for no other reason, than to try to keep them there for your benefit. That frog looks like he's staring at the crickets, hoping one will come out of the "shell".