I'm a kidney transplant patient (3+ months), is it safe to get a small amount of Botox between my eyebrows for my frown line?

I do not think there should be any issue with having Botox for your frown after a kidney transplant.  However, I would recommend discussing this with your transplant doctors to make sure there is no problem with the treatment from their perspective.  

I am not aware of kidney transplant contradicting with Botox. It is always best to check with your transplant physician.