Yes. Although their ears are covered by skin, they can still hear, and hear quite well under water.

Yes.I think leopard frog's ears are the small circular "discs" on the side of their head.

Yes, frogs can hear. I SAID YES FR...oh sorry. If they couldn't hear the males would be wasting a lot of time with that loud croaking trying to attract a female. Anon was correct about the circle on the side of the head being the ear. In fact it is the eardrum, or tympanium, which just means 'drum.' It is inside the ear canal in our own heads. (The ear drum not the frog, we have frogs in our throats not our ears.) That frog croaking is very loud in some frogs, between 90 and 95 decibels--almost as loud as a jack hammer (100 dB), bull frogs can be heard for miles. So to prevent the frogs from deafening them selves there is a direct air link between the ear and lung to even out and cushion the differences in air pressure outside and inside the ear. His eardrums vibrate in response sound, his lungs do, too. Frogs also hear with their LUNGS! which are only slightly less sensitive than his eardrums. Here's some pics of a frogs ear, # 3 in the photo. I was gonna send a pic of his amazing hearing lung, but when I cut open my frog so as to get a good view, he went deaf. I can get real close to him and yell REAL LOUD and he doesn't even move. I wonder where I put my frog glue?

Yes. I think they use the same technology as water-proof cell phones.

Yes, but they can't swallow with their eyes open.

Sure, Kermit the Frog can hear.