Yep... Me again I have a tendency to pick up every little flake! Some I just pick up because they're cool looking! Anyhoot the two pieces I'm having a hard time with are the round stone which is gritty on the edges and smooth on the top and bottom.. And the other is really gritty but the shape is artifact(ish)!
Okay, the brown stone looks to be a Hammerstone. The smooth section is part of the original cortex and the gritty section is from where it was used to peck other stones into shape. The piece in the last two pictures looks like it might be a piece of Stigamria which is a fossil tree root.
Here's a video of one I found this past Spring in Lewis county Ky.
Here's a link to some Stigmaria. I think yours is just very highly eroded and doesn't show the holes very well.