No. ngrok only tunnels traffic, so it cannot actually serve the HTML file for you.
You can, however, easily maintain a file directory. One of the fastest ways to start a server is to use python. From the command line cdto the directory containing your HTML files, and run:
$ python -m SimpleHTTPServer
Or for python3 (not installed by default for OS X):
$ python -m http.server
Then run in another terminal ngrok.
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