I grew up there. Most of my herping was in the Annandale area- a little south of St. Cloud. And around St. Paul, around the Mississippi and the St. Croix and the Zumbro Rivers, and some more northern Minnesota on trips.
Common Garter Snake, Plains Garter Snake, Bullsnake, Redbelly Snake, Smooth Green Snake.
Blandings Turtle, Painted Turtle, Snapping Turtle, Smooth Softshell Turtle, Spiny Softshell Turtle.
Tiger Salamander.
Bullfrog, Green Frog, Northern Leopard Frog, Pickeral Frog, Wood Frog, Mink Frog. (I got all the true frogs!)
Gray Treefrog, Western Chorus Frog.
Five-Lined Skink, Northern Prairie Skink.
American Toad.