Penguin was a unicycle brand, from the 70s. A couple of riders in RTUC had Penguin giraffes and I’ve seen a Penguin standard uni. They’re long gone as a brand, but that’s where the name comes from. I have a 5’ custom-made giraffe, but it’s not very low-rise, just not very tall.
Tom Miller (The Unicycle Factory) also made some low-rise giraffes, often with gear ratios, in the 80s. He called them Travelers.