I wouldnt try it on my pyxi. deli meat is really salty, has preservatives, chemicals, and carries all kinds of stuff that humans can digest, but frogs cant. plus packaged meat is riddled with different types of bacteria (people still get sick from deli meat) in retrospect, cooked meat is way different from insect meat.
Just a few questions; when was the last time you fed him, how much was it?
I can suggest you going to any pet store to pick up insects or any bait store that sells unscented nightcrawlers. Nightcrawlers have a good lifespan in the fridge and I always keep some on hand in case the pet store is out of a particular feeder, or my roach colony needs to be left alone.
good luck on your food find!