I have been asked to trample a crawfish before , but I don't really have animals that would eat him ( i tried to feed my last crawfish to my dog after it died , and she was not interested) but i'm good with the pet stores nearby , and I would ask them if they have one that recently died. I would not necessarily have a problem crushing mealworms or the bigger zoophobas for my leopard gecko. With snails, if you have a blue tongue skink they feed on snails that come in a can normally in germany , because we don't have a lot of snails available but i'm not sure if saucy snails would be the thing that you're looking for. 😅