T.Z.
There are 2 spray parks in Frisco that I know of. One West of the Tollway (off of Teal, I think) and one East of the Tollway just west of the intersection at Rolater and Coit. I have been to the later...my son is just about to be 14 months and he loves it. I have found it to be really nice. There is a covered pavillion and a small playground with climbing toys adjacent to it. School starts back in 2 weeks and I think they close the spray park at labor day.
I found them on the city of Frisco Parks and Rec website...there were maps to show you more specific directions if you are interested.
Welcome to town.