Assist LoRA for making frog-like girls. This one might take some time to get what you're looking for, but with enough finangling I've been able to get different levels of frogginess.
-- BIG NOTE --
You may have to fight against your model to get more human-like faces. I've found the best way to do this is to specify hair or facial features, or mix it with a face LoRA. This is why most example pictures use colored hair.
In general, a weight of 0.8-1.4 works well. The trigger word is "fr0g", but you can throw in frog features ("frog skin", "frog feet", etc) or "frog girl" to get things going. Add in "long tongue" for more frog tongue action, and tweak the weight if you get more tongues than you intended 😜. For a more subtle effect, just use "fr0g" and "green skin".