Gosling, 19, has spent the last three months with Dorchester and scored the winner in their FA Cup first round victory over Plymouth.
He started against Luton in their second round cup loss last weekend and could feature in as many as nine games for the Magpies during the next month.
Frear, 22, made four first team appearances for the Grecians during the opening months of the season before making the move to league leaders Salisbury for an initial month at the end of October.
That loan has now been extended for another month, giving Frear the chance to feature in a busy festive period for the Whites.
