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8F00E16F-A855-46E9-B951-B0DA9EF1CB63.jpeg  D72C2E59-B274-4BF1-9BE8-61BD349DBA7C.jpeg 
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Barrow Museum
From the photos alone, I suggest that 14 is a very eroded, tumbled, Lower Jurassic oyster shell of the genus Gryphaea. It has some interesting pits on the convex side, which could be modern borings (from when it lay in the sea recently) or possibly original Jurassic bio-erosion...molluscs and sponges boring into shells has been going on for many millions of years.
The rest of your samples are of indeterminate rock type.  Some look like flint nodules and these are likely flints that formed in crustacean burrows below the Cretaceous  seafloor around 80-90 million years ago.  They have taken on more or less the form of the burrows in which they developed and would qualify as "Trace Fossils".  Small shrimps (Calianassids) have a similar burrowing lifestyle today and create similar galleries of tunnels beneath the seafloor.  Rarely, fossils of their ancestors have been found in the fossil burrows giving some confidence that the interpretation is correct.

You don't tell us the area where these were collected, or provide a scale on the photos, so we can only guess some of the evidence in providing the best answer.
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Gary W
Most look like flints originally may have been sponges 
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Barrow Museum have got them spot on. I’d agree. 
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