Post a link to a picture of what you are talking about (there are tons of different ones out there). If it looks like this peeler, or a variation of this type, then yes you can made veggie noodles with it. Recently I sliced the eggplant for the Raw Bacon- recipe with one similar and the eggplant came out really, really, really thin. So thin, you could see through it.
The peeler mode may work but you might get a “thicker” noodle. The slicer looks really thick for noodles. I have one like this that mades very, very thin spirals and angel hair pasta. Then there is this type that makes thicker but still good noodles. I really like the one I have because of how thin the noodles come out. I got mine off of eBay. I have made noodles from zucchini, yam, and parsnip.