If you read back through my posts you'll see I believe, where I referred to my circumstances as "extremely ideal" so that has already been established.
In your situation the very air you and your animals breathe is far more polluted than it is here let alone the level of toxicity in the insects you might encounter so of course you should never even consider a local harvest of Amphibian prey. If it was you who had asked the original question, and you had explained your circumstances as Trout Hunter did my reply would have been specific to your needs as it was to Trout Hunter's.