My grandad found these eggs under a tile in the garden near his pond. It was stick in a little bunch like grapes there but then they fell off when he tilted

What are they? I think they are frogs and he thinks they are slugs and my grandma thinks they are spiders. Do you know?

Thank you

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My money would be on slug or snail eggs, these are not like  any spider eggs I've ever seen.

I agree. Probably not frogs either, I believe frog eggs need to be in water for the tadpole to survive.