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Looking at the clip, Star *did* say 'Easy peasy, time freezy' which may or may not be needed for the spell. Nothing was said or shown indicating that it isn't part of it. Somewhat tangential, though, as Star has other spells she uses wordlessly and without specific movements as you'd indicated.
It just bothered me more than it should, as I was sure she said some rhymey thing when she did it, but couldn't remember for sure. :P
Mind you, it's not clear whether Star could stop time again, given the events of that episode. I think that time would be less vulnerable to being stopped, but Star never tries to stop time again.