I have mullerlight yoghurts - sometimes frozen for a couple of hours.
Jelly - 2 syns for a packet of sugar free.
Angel delight - small number of syns plus milk.
Options hot chocolate - 2 syns each - much less than my favourite chocolate bar!
Morrisons strawberry split ice lollies - 5syns each.
If you like sweet snacks like cake etc try searching 'nutella' on here and look for Lady A's nutella cupcakes. BLOOMIN LOVELY and only 1 syn each!!!.... Must be ate cold tho.