I'm not familiar with Fromm but I looked up the ingredients and it has quite a few proteins - duck, chicken, fish and lamb plus grains, so could be an allergy. You would have to allergy test him to find out.
The recent vaccination is a thought, if he has just starting itching after receiving his vaccine, then there could definitely be a link. If you think you have a good and open minded Vet, discuss this.
In the meantime get some raw organic virgin coconut oil and give a flat teaspoon to start with either straight off the spoon or mixed into food. You can also rub the oil into areas puppy is scratching.
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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