Have you tried chocolate sauce? I haven't seen the Yeti yet that can resist chocolate sauce. It can even entice them to eat a piece of mincemeat pie, which Yeti's, as a rule, abhor.
I haven't yet tried chocolate sauce on a Hoth. I'll have to give that a try next time I see one.
These yeti seem immune.
If I had some tauntaun living here I could put chocolate sauce on them, the Wampa from Hoth would love it.