Some of them (the ones with the scalloped edges) look a lot like agastache seedlings, going from memory because it was last year when I grew them (I think, or maybe the year before). @Lyn sent me the seeds, so maybe she can have a look. My memory might be playing tricks. And other things could look much the same at the seedling stage, but I'd put money on them not being clematis.
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When I've seen clematis seed it is a small seed with a long fluffy tail.
Wisdom is not putting it in a fruit salad.
Edited to add: well there are some weedlings there that I recognise, but no clematis.