Well, a little update: Everything has panned out okay. My over-analyzing and worrying was just me freaking out!
This morning, three of the four crickets I offered them were missing. As the bowl is too high for the crix to jump out, it means somebody ate them!
I also got to see the frogs enjoying the enclosure. I added some 'palm' type plants, with thick stalks, so that they could have more things to climb on; I also added a few more branches. I saw the female out and about, finally resting on one of the branches and then proceding to hop into the water and hang out in there for a long time. The male wasn't quite as active, but he was still moving around and exploring.
Thanks everyone for the help! It looks like my frogs are happy and healthy! Now I just need to design a bigger vivarium. (There's always 'designing bigger vivariums' around my house, lol)