epipe-com

This plugin adds a favicon link to the document head section.
There are no options. The link is always added when the plugin is enabled.
The <code>favicon.ico</code> file needs to be uploaded to the site’s root 
directory. If you do not know how to do this, you should have a look at 
one of the other favicon plugins.

The Simplest Favicon

Adds a favicon link to the document head section.

Giorgos Sarigiannidis

WordPress includes a handy way to add a favicon on your site through its Site Customizer. This icon will be used as a favicon on desktop browsers, but on mobile devices as well, when users create a shortcut on their homescreen. What happens, though, if you want to have different icons on different occasions, either because, for example, iOS doesn’t support transparency or simply because you want to have a more detailed icon on mobile devices? This plugin extends the WordPress’ native functionality and allows you to upload different images for mobile (Android), iOS and Windows. Omitting an image will fallback to the default Site Icon.
<h4>Features</h4>
<ul>
<li>Extend the native WordPress Site Icon functionality to use different icons for Android, iOS and Windows.</li>
</ul>

Favicon Extender

Extend the native WordPress Site Icon functionality to use different icons for Android, iOS and Windows.

The Simplest Favicon vs Favicon Extender