We saw Xefros and Dammek eating some kind of Alternian pizza, but I think it's also implied that they're cannibals (at least sometimes) I mean, Grubsauce, beefgrub, grubs grubs grubs. Plus I mean, they're trolls. The stuff they're forced to do to survive might include eating someone of your kind. They also have milk, Faygo and TaB

And cotton candy, can’t forget that