The two players were previously teammates with Championship club Leeds United.
However, Snodgrass has now joined Johnson at Carrow Road, something that has delighted the latter.
"Snodgrass is a good player," Johnson told the club's official website. "I've seen him out on the wing during my time at Leeds.
"He can beat players, and he pulls a special moment out of the bag every now and again.
"He gets goals which will help us, and anywhere he plays - either in the hole or on the wing. I think he'll do well for us."