They have good neck mobility, able to reach high up so I’d say they could hold their head above the water like a snorkel
So you see how its front legs droop so much because they’re so heavy? This means its torso is tilted far forwards and so it can’t really lift its neck much more.
But giraffes can stand on flat ground and reach their head almost straight up above them. I tried to match the body position in the comparison image I made. I’m not sure why they think the giraffe’s legs would be so far forward but it doesn’t matter because it shows neck mobility
Yeah, maybe it’s because if they crane their neck upwards, their rump rises instead of their head
Ooh, this image makes it very clear why the floating position must be so uncomfortable for them

Or maybe they’d swim like this

Or maybe like this

The issue with that is it would create a very large lever arm (not really a lever arm, but it’s the closest way I have to describe it) with the buoyancy force of the neck disappearing unless the neck is placed in the water, and if the giraffe is holding it’s head up higher, the angle necessary to have the neck in the water while the body (the other significant buoyancy provider) is also in the water would dunk even more of the giraffe’s face in the water, almost certainly plunging the giraffe’s nostrils and mouth below the surface.
Oh yeah, like those Land Rovers that have a pipe for their air intake
The better question with giraffes is ‘will it blend?’.
What also floats in water? Churches! Very small rocks…
Now I wanna throw a church into water to see if it floats!
It has to be full or it doesn’t count
Why don’t … why don’t they just throw a giraffe in water to see what happens?