Definitely! Most shows have an email option and they'll be happy to hear from you.
You can find their emails by simply visiting their show websites. Here is a full list of sites with links: http://www.foxnews.com/shows/index.html
If you're on Twitter, feel free to "tweet" at our different hosts as well. They've often got Twitter open while they're on the air.
You can also reach out to them via Facebook.
For other feedback and questions relating to our shows and personalities, please email us at firstname.lastname@example.org.
Here is a list of all our on-air talent: http://www.foxnews.com/on-air/personalities