It is not a wood frog, look at the toes, it is in the tree frog family.
Given it was found in a nursery I would guess it is a one or the other of the so-called "greenhouse frog", either Eleutherodactylus planirostris or Eleutherodactylus coqui. They are infamous for colonizing greenhouses and getting transported all around because they bury their eggs in the pots where they skip the tadpole stage and direct develop into baby frogs.
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