It has a built in terminal called crosh, which might have an SSH client built in (I'm not sure). What most people do is download a chrome extension like Secure Shell[1] that lets you ssh from a tab.
crosh> ssh
The 'ssh' command has been removed. Please install the official SSH extension:
https://chrome.google.com/webstore/detail/pnhechapfaindjhompbnflcldabbghjo
crosh>