I'd go with teasel. Our neighbour planted/sowed seeds to feed the birds/bees in some waste ground behind us and now they are coming up in my garden.
Please can we see a pic taken to show how it is growing up.
I hate to say that the nearest I can get it Cirsium heterophylla...common name melancholy thistle.
I can see the leaves are white /silver on the backs.
The veins look a match.
I just love to see these growing in the wild...quite beautiful.
Just for ref this is Dipsacus fullonum...common teasel.
Leaves in pairs.
Stem is prickly.
Leaves underneath also have prickles on the midrib.
Top of leaf warty.