Our first three are the most common type that wasn't made intentionally as an animation by the original creators. Blink, mlem, and talk all alternate between two existing emoji. The only difference is which eyes are used for blink and which mouth is used for the other two. These should be pretty easy to make using Ezgif if you grab a pair of them or use the neomoji maker. Blink uses 35 frame closed, 350 open, then 35 more closed on an infinite loop. The other two alternate between 10 frames with a closed mouth and 10 frames doing a thing.
Pacifier is similar to those but instead of alternating between existing emoji, it uses a single emoji but has an object placed on top of it that alternates between and up and a down state every 25 frames. I'd have to ask @Erpel whether he tried different durations or considered scaling instead of moving when he was fiddling with making them.
If you want to play around with the second kind of animation, I'd encourage you to look into neopossum and neobread because they are both available as SVGs which makes them easier to work with.
Neofox rolling is included because it's the most elaborate one that I've seen which wasn't made with a generator. It rotates 45 degrees between frames and swaps to a different face for a couple of them.
The next four are neofox_bongo which alternate between neofox_bongo_up and neofox_bongo_down. The normal one alternates every 10 frames. That gets sped up to 8 frames for _fast, 5 frames for _faster, and 3 frames for _hyper.