Kids love playing with walkie-talkies. I know I did when I was young. I assume that most toy walkie-talkies made nowadays are better then the ones I played with back then. They are definitely smaller now, and they have digital readouts and antennas that are less likely to break. These are great for playing police, fireman or spy. Make sure the walkie-talkies you get are sturdy, because kids do tend to drop them.
The walkie-talkies I had with were very clunky. I wish I would have had these to play with when I was a child:
Toy police walkie talkie:
Toy police walkie talkie pictured: Cobra MicroTalk Walkie Talkies – 25 Mile Range – Police Black