This is, indeed, a nymph) (what you called a young stage), but not from a cicada as you suspected: it's a nymph from a leafhopper, which are hemipterans from the Family Cicadellidae (cicadas are also hemipterans, but they belong to the Family Cicadidae). More specifically, this seems to be a sharpshooter), which are leafhoppers from the Tribe Proconiini.
Narrowing down to the Genus is more complicated, but I'd guess it is _Oncometopia_. Here is an image of _Oncometopia orbona_ for comparison:
 is even more similar to yours:
![enter image description here](