Look at this diabolical face!
The downy upper portion of the leaf scar points to Butternut (Juglans cinerea).
This one, on the other hand, baffled me. I couldn’t find it in Core and Ammons’ Woody Plants in Winter. (It is in there, though.) iNaturalist people provided the identification: this is the incredibly common Ailanthus (Ailanthus altissima) or Tree of Heaven.
These were side by side saplings, spontaneously sprouted.
A tiny spider on the Ailanthus.
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This work by Matthew Wills is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States License.
Backyard and Beyond 
looks like Lambchop to me.