Personally I have not seen much foam on my honey but it could be that I only process spring honey.
I did find this:
"Honey Foam : The White Stuff On Top
Posted on January 9, 2016 by Bean
Honey foam may be one of the most surprising things about the appearance of raw honey. It is often greeted with the words: “What’s that white stuff on top?” Regardless of the raw honey’s form, runny or crystallized, it may be topped with a thin layer of froth, which will solidify in crystallized honey. If you find this honey foam in your jar, consider yourself lucky.
Honey foam is delicious. It is light, flavorful, and packed with air bubbles that have trapped some of the wondrous stuff that is in raw honey: pollen, propolis, wax, and, of course, raw honey."
https://pacificnorthwesthoney.com/honey-foam-the-white-stuff-on-top/
I did find this:
"Honey Foam : The White Stuff On Top
Posted on January 9, 2016 by Bean
Honey foam may be one of the most surprising things about the appearance of raw honey. It is often greeted with the words: “What’s that white stuff on top?” Regardless of the raw honey’s form, runny or crystallized, it may be topped with a thin layer of froth, which will solidify in crystallized honey. If you find this honey foam in your jar, consider yourself lucky.
Honey foam is delicious. It is light, flavorful, and packed with air bubbles that have trapped some of the wondrous stuff that is in raw honey: pollen, propolis, wax, and, of course, raw honey."
https://pacificnorthwesthoney.com/honey-foam-the-white-stuff-on-top/