Oh! @meret118 see above comment! The use of the word "enjoyers" instead of "users" or "bloggers" -> You left a comment a while back asking, "Does this just mean vocabulary words? Other than blorbo and sweet cinnamon roll etc, I can't think of what a Tumblr accent would be." I almost never see anyone use the word "enjoyer" anywhere outside of tumblr, but I see it on tumblr fairly frequently.
Another one is the verb "perceive" i.e. "don't perceive me" "I am perceiving" "I am being percieved." That's something that feels very specific to tumblr parlance.
There's the thing where people on tumblr have an emotional reaction to something and instead of, or in addition to telling you how they feel about it using emotion words, they will narrate a fictional action in the present progressive tense. "I am gnawing at the bars of my enclosure "I am kissing you on the mouth" "you are going into the soup" "you are getting all of the awards"
I once saw someone use that response format in ... I think it was a restaurant review, or a doordash review, or something like that. It was very unexpected seeing it outside of a tumblr post.
There are a lot of other tumblr linguistic quirks I can't currently remember off the top of my head, but I'll instantly recognize them if I see/hear them outside of tumblr. It's always a bit startling to see them out of context.