Not having recalled seeing the designation "Ultra Cameo" on a PCGS coin, my curiosity was answered by the following:
"Deep Cameo. NGC refers to “ultra cameo” coins, while PCGS calls them “deep cameo” coins. According to PCGS, the difference between cameo and ultra cameo is primarily the level of frostiness and quality. ... Also, cameo and deep cameo coins are defined by PCGS during the time period of 1950 – 1970."
Comments
A few frosted photos from a prior winter:
Likely from the same mint?
Cameo Frosty in a confetti storm

"Jesus died for you and for me, Thank you,Jesus"!!!
--- If it should happen I die and leave this world and you want to remember me. Please only remember my opening Sig Line.Snowball is very entertaining , HuH, Mitch "

Ho, Ho, Ho !
Page out of my work-in-progress book.

That "Ultra Cameo" pops.
Not having recalled seeing the designation "Ultra Cameo" on a PCGS coin, my curiosity was answered by the following:
"Deep Cameo. NGC refers to “ultra cameo” coins, while PCGS calls them “deep cameo” coins. According to PCGS, the difference between cameo and ultra cameo is primarily the level of frostiness and quality. ... Also, cameo and deep cameo coins are defined by PCGS during the time period of 1950 – 1970."
https://sbcgold.com/blog/ultra-cameo-grade-coins/