It turns out that image style tokens are an easter egg of the regular Token plugin, ported in from the Imagecache Token plugin on this ticket.
Image style tokens don’t show up in the media browser, and so you sort of have to guess at how to use them. I figured it out by studying the merged commit that added the functionality.
Source: New feed
Glassdimly tech Blog: Cheap WordPress maintenance support plans 8: How to Get Image Style Tokens for Metatags
