Akinde joined the Robins for £140,000 from Ebbsfleet but has made just one Championship start.
The Bees have also extended the loans of striker Lionel Ainsworth from Huddersfield and defender Tommy Smith from Ipswich.
Ainsworth, 22, joined from the Terriers last week on a one-month deal but has now agreed to stay until the end of the season.
Smith, 19, has extended his loan from to three months.
He has struggled to make an impact at Ashton Gate where he has made just one Championship start.
Source: BBC Sport
Source: BBC Sport