Kellogg’s is waging a war here over Tigre Toño and Sam el Tucán.
A 2019 policy requires companies that make unhealthy foods to include warning labels on the front of any boxes they sell in Mexico to educate consumers about things like excess sugar and fat. Any food with a warning label — like Kellogg’s Fruit Loops or its Frosted Flakes, which typically contain more than 37 grams of added sugar in a 100-gram serving — is also banned from including a mascot on its packaging.
At least according to the studies, and reports from people I work with and friends, yes, they do seem to work. Here you can read a Google translated article talking about the effects since the law came into effect in Chile in 2016: https://www-ciperchile-cl.translate.goog/2021/05/24/ley-de-etiquetado-evaluando-sus-efectos-en-consumidores-y-empresas-de-alimentos/?_x_tr_sl=es&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=wapp
It’s good to note that another consequence of this law, is that apart from the mascots being prohibited, it’s also prohibited to play ads for unhealthy foods (not sure if they need to specifically target children, or not) aren’t allowed until after a certain hour in the evening, like 9:00pm or something.