There is this logo as well: https://www.python.org/static/community_logos/python-powered...

Source: https://www.python.org/community/logos/

ah, I was thinking of the blue and yellow double snake logo

Yeah I feel like "recall" is being confused with "recognize" here. I'm sure any programming who's been at it for more than a year would also recognize the Rust, Swift, Kotlin, and probably even Elixir logos. But I agree that Python and Java are some of the easiest I can recall despite not having worked regularly with either of those languages in the past year

An even more recognizable logo would be the coffee cup.

In my headcanon Duke is a personified Ouija board planche. Just like the planche is the go-between for the user and the Ouija board, Duke is the go-between for the user and the tablet computer for which Java was originally designed.

It might be a bit of a stretch, but he was originally more than a mascot but a "software agent" through which the user's actions were carried out, a sort of more active version of Clippy.