The Whisker Lickin things are treats. I would say yes, they're "safe" in a reasonable quantity, but the ingredients leave a lot to be desired.
I have 8 cats, so my thoughts on things are maybe different...but one day I realized that my cats would go NUTS over anything that was crunchy that was not their regular food. So I just get small bags of dry food and pass that out as "treats". I haven't brought anything home that they didn't go bonkers for. They have enjoyed Solid Gold, Raw Instinct, Felidae, Wellness, and a bunch of others. Just a thought.