Search Randomizer App?

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Hi /g/. First, let me say that this is not my native board, so I apologize if this isn't the right place for this question. Also, I'm not a computer or tech expert by any means, so this all may sound incredibly retarded.

Background:
I have an acquaintance who is having a bizarre happening with one of her mobile devices. Her kid also uses the device and lately some odd things have been appearing in the search history. Things this child would be too young to search out on purpose (they aren't necessarily bad things, just things a kid his age wouldn't seek out intentionally) and things she hasn't searched. She is now suspicious that her kid may have covertly installed some kind of random search generator app in order to change his searches to random things so he could cover his tracks.

Personally, I don't know of anything like this, but I wanted to ask if this would even be possible? Is there an app or some kind of program that can rename searches/websites that you want to hide into other things on the search bar? My other theory is that this mobile device may have been infected with some type of spyware or whatever and is being controlled remotely, but isn't this very rare for an Android tablet to have happen, if not impossible? My final theory is that maybe he just clicked on some ads or something else pretty benign and unintentional.

Since my knowledge is limited on the subject, I figured I would see if anyone here could offer insights and other possible explanations for what is happening.