About the "Always Smile" Ones

This is about the vastaya race of fish people,like the Marai which Nami is one of, that are described as the carnivorous ones. Now what I wanna know is are we talking more piranha where they have a bunch of teeth that keep their mouths in a permanent smile like a barrier of teeth or are we talking more Axolotl where they just have a smile always on their faces and are adorable but maybe have a knife on them somewhere? https://cms.qz.com/wp-content/uploads/2018/06/h_01204239-e1528902368212.jpg?quality=75&strip=all&w=410&h=231
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