Hi Judith,
Did you ever find an app to use inside Resolve or at least work separately on your local computer for this? I know there are AI apps online that can do a good job but the ones I've tried tend to only work for very short clips that you upload.
Note: you seem to have a typo in your thread title (sartoon instead of cartoon!

) You might want to edit the title so more people respond? Although I looked at your post only because I wanted to know what "sartoon style" was!
I looked around real quick and found a video of a guy showing how to create a cartoon effect just with DaVinci Resolve effects, just add Abstract and Watercolor to the clips. It's an OK affect and with some more tweaking could be even better? I can't post links yet (because I guess I'm too new here

) but the video is by "WebbsWeb" and titled "Create Video Cartoon Effect -Davinci Resolve 18" if you want to look it up.