Scatback is really not a term I hear all that much these days.
Generally you hear speed oriented guys referred to as change of pace backs or third down backs, although some teams prefer a bigger, blocking back along the lines of Kimble Anders or Tony Richardson (in other words, a fullback...) in the 3rd down role, because they're better in pass protection than smaller backs.
Either way, we're talking about backup runningbacks, however you want to label them...
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