If they are flash files, yes. Wildform is a good flash creation tool. I prefer Swish, myself, but Vegas will accept any flash you drop on the timeline so long as it is not Flash MX format.
I experimented for a while using Swish to generate some text animations (wrestling shows, you gotta have a nice effect to put the wrestler's name on screen).
I used Swish2's zooming text, which was *nice*, but it didn't have the features I really wanted (and, I'm a demanding thing). So I'm using Blufftitler at the moment to do some fly-in, light shaded effects with the wrestlers' names.
Is there a tool that generates SWFs I can use for titles, that allows me to shade the text with a gradient and apply some effects like a glow or emboss? (Think Photoshop plugins).