Does anyone know about schools that have both agricultural engineering and bioengineering?
UIUC, Ohio State, Texas A&M, Wisconsin, and others. You can probably find both of these at any large land-grant university.
https://nces.ed.gov/collegenavigator/?s=all&p=14.0301+14.0501&pn=1&l=93&ic=1
You may want to check on college web sites, since the major may be named differently, or its emphasis may not be exactly what you want.
Purdue
Michigan State https://www.egr.msu.edu/bae/
Iowa State University https://www.abe.iastate.edu/
Wisconsin https://bse.wisc.edu/
Google is your friend.