Might be useful to send letters to Disney's and Mattel's legal departments. Mattel paid a lot of money for that Disney license. Disney is very protective of those licenses. Mattel lost the Disney license to Hasbro for a few years due to overproduction of low quality dolls. I'm surprised to see Funko selling low-quality Disney dolls. They degrade a Disney brand.
[1] https://funko.com/pop-tyrannosaurus-rex-fossil/80225.html
[2] https://licensinginternational.org/news/mattel-and-universal...
[3] https://funko.com/fandoms/animation-cartoons/disney-princess...
[4] https://corporate.mattel.com/news/mattel-and-disney-announce...
Besides, Disney is perfectly capable of degrading their own brand.
Disney chases down little daycare centers: https://www.snopes.com/fact-check/daycare-center-murals/
They would not miss Funko.
But I agree this is most probably futile :)