Coprolite? Botryoidal?

[finderskeepers78]

Is this Coprolite, Botryoidal or something else? My first initial guess was Coprolite but endless google searches have me second guessing. Found all three in the river bed on North Sulphur River. 

[Miocene_Mason]

The NSR is known both for its coprolites and it’s iron concretions. I would guess iron concretion but perhaps a local or one of our resident Coprolite enthusiasts could weigh in.

[Innocentx]

I think you're correct about weathered 

2 hours ago, finderskeepers78 said:

Botryoidal

concretion. 

[abyssunder]

Really nice ones.
I usually call them "crocodile skin" concretions.
See this older topic:

[Innocentx]

@abyssunder  That's it!

[GeschWhat]

I would say concretions as well. Although, the one on the left appears to have some lighter colored material underneath. What does the other side look like?