In Mexico, the kids use a sort of pig latin-type play on the language to confuse people. In this variant, they insert an “f” after every vowel and then repeat the vowel. Sounds easy, but it can really break up the words and make them hard to understand without a lot of concentration. For example, saying “como estás” turns into “cofomofo efestafas.” Does anyone know of any other languages’ equivalents to Pig Latin?
You don’t have to go outside English. There’s other children’s games like this in English, as well. Two which are similar to the thing you cite in Spanish are “oppish” or “alfalfa talk” which involve insertions following consonants instead of vowels - “op” or “alf”.
In Spanish it is also done with other consonants other than f, like p or t. And you can also add silly syllables, like “chi” before or after each syllable. It’s all called jeringonza. Sadly, I’m unable to speak using it.
In Hebrew there is a “B Language” which involves putting B (or course) some darn place in the words. Forgive me, the only thing I can say with certainty is an Israeli song “Love in the B Language” won Eurovision one year.