Is there a way to get twixtor or something similar for iMovie?

While iMovie doesn't natively support Twixtor, you can achieve similar slow-motion effects using its built-in speed adjustment tools. You can slow down clips by selecting them and adjusting the speed in the "Modify" menu. For advanced slow-motion effects like Twixtor, consider using third-party apps like Final Cut Pro, which offers more sophisticated frame blending options. Alternatively, you could use a dedicated slow-motion software before importing the footage into iMovie.