It’s not uncreative to call your app “Image Resizer;” it’s descriptive. If I’m not using the app every day and it has a creative name, I’m going to forget what it’s called. And because I’m installing and trying new apps all the time, if it isn’t a descriptive name, I’m guaranteed to forget it. It’s going to get lost in a sea of other apps, and I’m sure to never find it.
I’ve developed habits to work around Inventive Names, but… just call it what it is, or some variation. “Resizeratus Rex,” or something.