If not, is there another app that gives this functionality?
There is no timer built in, but you can crop images in the standard gallery app which is essentially the same as digital zoom.
There are a number of apps which list timer functionality (I haven't tried them myself so can't verify first hand how well they work):
- Camera ZOOM FX ~ also lists zoom and "clap to snap" features
- Camera Self-Timer
- Camera Advance Lite
Plus a load of others.