There are 4 bus routes serving Frodsham. The 48and 48A runs between Frodsham and Northwich, with the 2 others terminating in Chester.
The various bus stops (and their routes) can be found here with the various timetables and operators detailed below:
X30 - Chester Bus Interchange - Warrington Bus Interchange A bus service operated by Arriva North West [Arriva Home]
Bustimes.org contains a 'live' map of running buses and stops.