In addition, frozen custard can be kept at a warmer temperature compared to ice cream, which allows the taste of added flavors to come through more strongly. Thus frozen custard has a much denser consistency than ice cream. (Genuine frozen custard has at least 1.4% egg yolk solids.) The machines used to make it barely incorporate any air into the mix.
Frozen custard is an enhanced form of ice cream, made with eggs in addition to cream and sugar.