Exactly what subject line says...I'm looking for a fake spunk recipe that still tastes reasonably OK. Any suggestions. Thanks

Use sweetened condensed milk, perhaps?

Coconut milk/cream
Icing sugar (powdered/confectioners sugar) and water to make a thin icing/paste.
You could probably make a cornflour/water mix which would look similar, but wouldn't taste too good.
White Mocha syrup if you can find it, although it'll probably be way more expensive than the other options!!