To be fair, I feel like all of the women basically (except maybe Gothel) are all just reskins of the same model with a few tweaks to them. And I don't mean that lightly - I think they're all based off of Penni's design (Bolt) and just adjusted. Anna, Elsa, their mom, Rapunzel and her mom, and even some background women that appear in both movies, all look like they share the same model and just have different tweaks to eyes, hair, and bridge of the nose and tip of the chin.
And the chameleon actually I think might be based on Pascal, but I think it's more likely it's a re-used asset from Pixar's movie that was going to have a chameleon/lizard in it that they scrapped when movies like Rango were coming out at the same time.
I get the feeling Disney isn't above the same staffing yanks that SquareEnix does where it pulls staff from one department who's working on one project to work on another. (ie staff that were working on Type-0, 15, FF13-3, KH3, FF7r basically were constantly shuffled around) Now that Disney has possession of Pixar (a group of animators who left Disney to be more creative), I doubt it's above them to do the exact same thing and yank staff from working on, say, Onward to work on Frozen 2. Or to yank people from Frozen 2 to work on Onward.