Can anyone tell me what these seedlings might be

[AndrewAZ]

I am horrible at growing from seed.  So, I get my best germination rates when I plant seeds and forget about them.  However, the problem often becomes later ID.  Can anyone tell me what these 3 seedlings might be?

[pinkturtle]

Google Len "Phyllanthus urinaria, commonly called chamber bitter, gripeweed, shatterstone, stonebreaker or leafflower, is a herb species in the family Phyllanthaceae"

[Mike T]

Not labelling correctly and permanently is one of the worst sins perpetrated by fruit growers. It renders valuable trees worthless and makes for future pain and repercussion. Seeds not properly identified passed on to others is also a grave mis-deed.

[Plantinyum]

The last pic looks like a locust seedling or a root sucker. Young black locust shoots look exactly the same ,from my experience.