In android studio, there are a few templates for new activities/fragments. If you're looking for something that you can download and just change a few variables, it will probably take you longer/be more confusing than actually learning to program an app.
Each app has their native source code. For android it is java/kotlin, and iOS it is swift. React native is a framework to create your apps for both platforms at the same time(ish). Programming in the native languages vs using React has their own pros/cons, so it's up to you what you want to do.
If you are adamant on using a template, then a simple google of 'react native app templates' will probably be what you are looking for.
I personally recommend going the honest route and learning to program your app, it's not too difficult, and you will learn a lot!
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