Ollie's is the only place to go for frozen custard! They have the best! My 3 year old loves to go here just because they give you large portions and when you order whipped cream it is a HUGE serving with a cherry on top.
They have excellent custard - vanilla & chocolate being the staples and then a flavor of the day. Peolple come from all over just to go to Ollie's. Beware that if you go in the middle of summer after dinner, the line will be around the corner and it doesn't matter if it's a weekday or weekend. Typically they serve pretty fast and we've never waited in line longer than 20 min. It's soooo worth the wait.
If you don't want a long wait, I would recommend going on a weekday before dinner.