Salmon makes a few appearances in Calvin and Hobbes.
It is not as commonly mentioned as tuna but is mentioned.
When the family had it for dinner, Calvin exclaimed that he dislikes salmon, and so brought it up to his room to give to Hobbes, to encourage the latter to finish his homework. The monsters under Calvin's bed also once tried to get Hobbes to push Calvin over by saying they had fresh salmon. It is unknown if the plan succeded. A strip arc was also featured in where the salmon was mentioned but the arc was not about the salmon, however; Calvin asked his mother what they were having for dinner, to witch she replied 'salmon' causing Calvin to make a disgusted face and his mom reminding him that if he kept making that face, it's going to freeze like that forever, much to Calvin's amusment.