Are you talking about Leeches?
If yes, I recommend you this script. It’s one of my favourite scripts, besides @acm2010’s scripts (visual & phonetic).
My leeches screenshot:
I usually squash the first durtle. I can see it moving down to number 7 or 9, then 19 or 20, then disappear, then it could come back, or it could go to my burned durtles.
If you’re talking specifically about how to star a durtle like we do on Google Mail, I don’t think I’ve seen that feature on WK by defaults. This is why we need userscripts.