Browse any country's App Store on your iPhone. Your Apple Account stays untouched.
How to use it. Tap a country and the App Store opens on that storefront. Search for whatever you want from there, as usual.
You can browse and search any storefront, but you can only download apps from the one your Apple Account belongs to. Tap your own country when you are done to switch back.
Why this exists. Search ad placements and rankings differ by country, and Apple serves them only to the App Store app on a device. This is the quickest way to see what a search really looks like somewhere else.