First, there's only one aspect to that is really objectionable--that the federal government gets the data with no limitations. A fingerprint scanner isn't a bad idea for something needing low security where you're dealing with forgetful preteens. They're inexpensive although the software/system isn't.
To be honest, I don't really understand the objection to being tracked in the first place. It's just an extension of tracking food stamps. The government makes no secret that if you're going to be the recipient of funds, you're going to be tracked (unless you're a multinational corporation). All that needs to be done is explicitly state that the data will be anonymized (which is likely to be done anyway as this involves minors) and there's minimal issue here.