Well, mostly hearing people say the words will be telling.

Gävle in Sweden: https://forvo.com/word/g%C3%A4vle/

Linnanmäki in Finland: https://forvo.com/word/linnanm%C3%A4ki/

In the Finnish example you can hear both the soft “en” (linnan) and the higher pitched “” (maki) which is triggered with umlauts;

Where the Swedish A is softened by umlauts in the Gävle example.

That's an american cat then, because that sounds crazy to my ears