Fun safe stuff to put in a frozen enrichment toy?

I recently got my dog a little freezable penguin toy with a hole in his belly for frozen treats. So far all I’ve done with it is peanut butter, which he goes crazy for, and some of his wet food which didn’t freeze very well. If anyone here uses a similar toy I would love to know what types of stuff you put in it.

submitted by /u/Jdbeepbeep
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