A deleted scene from Legends of Tomorrow season 5, episode 6, “Mr. Parker’s Cul de Sac,” mocks Aquaman. In the episode, Ray Palmer watches a television show from his childhood titled "Mr. Parker's Cul de Sac." Mr. Parker (Eric Gow) is an obvious parody of Mister Rogers from Mister Rogers’ Neighborhood — just a twisted, sad-sack version. A deleted scene of The Mister Rogers homage also references another retro children's TV show: Super Friends — specifically, its version of Aquaman.
While only a couple of short sequences from “Mr. Parker’s Cul de Sac” were shown in the Legends of Tomorrow episode, more were made and released online (via The CW). Most of them are odd versions of kids’ show segments showing Mr. Parker’s slow descent into madness and depression. One, however, contains a very clear jab at a specific version of Aquaman.
The short Fish Food, a cut scene from Legends of Tomorrow, includes a rather pointed joke directed at Aquaman. As Mr. Parker talks to the kids about how fish require different food than humans (and accuses his producers of feeding him fish food), he starts to muse about living underwater: “If a superhero could breathe underwater, talk with the fishes, ride a big sea horse... why they would be the most respected of all the superheroes. No one would ever tease them.” This both manages to sum up the Super Friends version of Aquaman perfectly, while completely missing that those are the exact reasons that people mock him so much.
Adding to the joke is that Legends is already exactly goofy enough for such a version of Aquaman to fit in with the show's tone. If a man showed up riding a seahorse and talking to fish, he’d be no weirder than anything else that’s happened on the show. Legends had a giant Beebo (a toy in the universe akin to a Furby) wrestle a time demon to death. They’ve already even used bits of Super Friends, with the season 2 having the Legion of Doom as the main antagonists. That makes this Aquaman joke feel like an affectionate jab, even if Mr. Parker liking the corny version of the character is supposed to demonstrate how disconnected from reality the television host is.
The Legends of Tomorrow reference to Aquaman is in a scene that didn’t make the final cut during the show and may not be canon. Whether or not Aquaman exists in the Arrowverse is still unconfirmed; however, a Super Friends version would fit right in on the Waverider.