I don't know if this is truly the smallest non climber available for food use; But it's the smallest one that I've come across. I'm currently in the process of breeding these and so far it's coming along well. Hope to have some for sale by the end of summer.
Common Name: Turkestan cockroach
Scientific Name: Blatta lateralis
The common name comes from its having been collected in the Asian province of Turkestan. Its distribution is Egypt, Libya, Sudan, Saudi Arabia, Israel, Jordan, Iraq, Iran, Pakistan, India, the Soviet Central Asia, Kashmir, Afghanistan, and the United States. Adult males about 1/2-7/8" long whereas, females about 3/4-1"long.
If someone else knows of a smaller one that would make a good food source please advise.
Thanks,
Dan Haas
Crunchy Critters Roach Farm