Nope, it's the right name. I looked on the map and it's above Prettyboy Res. You're correct that it is a smallish creek but by my estimation, from the little stretch I drove along, it looks very fishy. I wouldn't mind wasting a couple hours to see what its like.
https://www.google.com/maps/place/Lineboro,+MD+21102/@39.7187684,-76.843761,16z/data=!4m2!3m1!1s0x89c842b48791cfa5:0x39a54b4b28a4adb
Here ya go, I followed it around here. I'll be spending some time south of the border this year!