After spending the last 3 weeks and about ~100 attempts on trying to create this LoRA, I finally got a version I'm kinda happy with. Trained on 919 images. There is still a lot to improve but it can give good results.
The sample images are raw outputs (txt2img + Hires. fix). I used the embeddings UnrealisticDream, BadDream (by Lykon) for some examples. All examples made with RealisticVisionV51 (by SG_161222). CFG Scale of 7 works fine.
Main Keywords are:
tongue out (749 trainers)
ahegao face (407 trainers)
drooling (99 trainers)
wet tongue out (77 trainers)
wide open mouth (44 trainers)
Limitations:
Subjects further away from the camera don't really work that well
Bias towards nose piercing (In a lot of training images)
Bias towards animal ears when using "ahegao face"
Keyword "wide open mouth" sometimes produces terrifying outputs
Keywords "tongue out to the side" and "licking lips" don't work (Not enough training images)
Might not work for males. Didn't test
There would still be a lot to improve. I used a lot of medium quality (and some kinda low quality) images. But its hard to find more high quality images. Also I wasn't able to train above 512x512 since my RTX 3060 Ti couldn't handle more. That might could have improved quality also. I would love to make a SDXL Version but i'm too poor for the required hardware, haha.
Note: The example images have the wrong LoRA name in the prompt. Tongues_V62-000012 was my original name before changing it to TonguesAndAhegaoV1.
I appreciate your feedback!