Let’s just call this format something like “text-added photo” and not get into what can or cannot properly be called “meme”.
There may or may not be a discoverable individual “author”, but I wll lazily enough use the name of the person posting to Facebook Group “The Daily Pun”.
Comics I Don't Understand 
The Saturday morning “Mutts” strip does continue this storyline with the invasive Xmas tree, but doesn’t seem to land on a pun. Ah well.
I liked the “sap” one best, I think, because of some trickiness of how the pun-word is used.
Correct, that is not really a “meme”.
What is the textbook definition of “meme?”
It’s the reply one makes to someone asking “So, who wants this last piece of candy?” However, it’s usually spelled with all caps and punctuation marks, thus: “ME, ME !”
I don’t get the second Mutts one. Pine?
@Chak, I agree it’s peculiar and maybe doesn’t work perfectly. In panel 2, “Pine” is straightforwardly his answer to the question of what kind of tree it is. But the cat (Mooch?) takes it to be a verb, or indeed an imperative, and proceeds to comply by acting out pining.
That’s the part I’m not really convinced of, as he is emoting in general but not very specifically doing what I think of as pining. Maybe because I’m thinking of “pining away”…
Not to mention his brother E. Z. Marx, who invented the confidence game.
Good marks for “The Daily Pun” one!
The Brevity entry, while brief by Brevity standards, is also funny only if it’s not yet dawned on you why electronic pagers are called that, and yet you are old enough to remember them.
@Ooten Aboot, you may be using too short a horizon about paging. Long before (and after!) the electronic paging devices, people were paging others and being paged in all sorts of other contexts and methods. Think of the very old cigarette ad with the hotel employee (perhaps actually a “page” if not a bellhop) shouting out “Call for Phillip Morris!”. Or when the tannoys at the airport or railway depot announce “Mr John Smith please pick up the nearest red courtesy phone” we say he has been paged.
Also I’m a little confused about the medieval ranks and roles. Obviously the little guy in the back shouting out is meant to be a page, for the joke to work. But I thought a knight’s helper was a squire, not a page — the pages were at court, not on the road. Meanwhile the page (or squire if you buy my correction) is calling out and addressing his master, the knight, as “Squire” — which would fit with the use of that term later for a member of the landed gentry perhaps, but was it something a page (…or squire) would call a knight?
He’s a bit dressed up (armor, sword, shield) for a squire – but if you accept that he’s a squire (maybe late in his training, about to become a knight), it’s more or less reasonable that a page would be sent to fetch him. Pages were at court, yes, and not assigned to anyone in particular (thus used to pass messages), but there’s nothing really to indicate that he’s on the road rather than somewhere around the castle/palace. For that matter, he’s definitely at some sort of castle, with a tower with maidens at the window…
A squire was someone who attended a knight and was just below him in rank.
A page was considerably lower in rank and was generally a boy or very young man. Sort of an errand boy.
Saturday’s final “tree” strip may not be an “oy”, but I think it still qualifies as an “Oy! Veh!”, and should be documented here: