Fredericks, who managed to make only one appearance off the bench for Spurs this season, joined Millwall on loan a day prior to the weekend's clash.
Manager Ian Holloway's first piece of business in the January transfer window paid off after 40 minutes when Fredericks found the back of the net through a fortuitous strike.
The midfielder found space on the wing and sent in a cross that managed to beat everybody, as the ball floated over the head of Ipswich goalkeeper Dean Gerken and into the net.
The win allowed the south London club to move up to 20th on the Championship table, a point clear of the drop zone.
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