The team has never been referred to as Justice League on screen. They have been referred to as:
■ In the episode Run, Bart mentions to Clark that the two of them and other people like themselves should "form a club or a league or something". This is a reference to the Justice League of America.
■ Emil Hamilton referred to them as "Oliver and the league" in Rabid.
■ Rick Flag when he was Oliver he called his "vigilante" team a "League of heroes" in Shield.
■ Dinah Lance calls them "The League" while talking to Clark in Collateral.
■ In the episode Justice, Oliver said that their team name should have the word "Justice."
■ John Jones referred to the team as "SuperFriends" in Prey. The term SuperFriends was first coined by DC writer Gardner Fox in the early 70's. It was intended to be a more child-friendly version of the Justice League.
■ Oliver wanted to know where the other "SuperFriends" were in Absolute Justice, Part 1.
■ Chloe also has referred to them as "SuperFriends" in Warrior.