Can animations run on différent framerate ?

Hello all ! Hope you're doing well with your projects 😊

As an absolute beginner in 2D animation, I am both looking to create a not too bad looking game, but also to make my life easier as I don't plan to spend my next 50 years on animating my game.

So, the question is :

-> With 2D animation ( sidescroll view here ), do you keep the same framerate for every animation, or is a 5/10 FPS for certain simple animations ( idle for example ) enough ?