treats for ducks

Hi guys I have a question..can u feed ducks mealworms? How many mealworms should u give to each duck? I have two 7 months drakes...And should I cook the mealworms with boiled water and give it to them with water or should I just mix dried mealworms into their dry food?

Any suggestions on affordable treats for ducks? I’ve tried giving them corn, lettuce, peas, green beans and they don’t seem to have that much interest in them. I would give them berries but that would get pricey. so what do your ducks Like? Right now they only seem to like tomatoes.

I've seen a lot of tiktoks of people taking their pets to Starbucks for a "pup cup" (it's just a small cup of squirty cream) and I was wondering if that was safe for ducks and chickens? It looks like a fun treat for the flock, but obviously I don't want to make them sick!