No there isn't and you are conflating a meaning without a distinction, you are equating Dwarves in the mythical sense with Dwarfs that actually are real human beings.
Andrea the Giant was a real Giant, not jack and the beanstalk.
And no Germanic Mythology has fuck all to do with what you are talking about, the only reason YOU draw comparisons is because of Hollywood, which is based on the same bullshit I just explained about Sonic the fucking Hedgehog.
But but Hedgehogs do exist, yeah they do, but they aren't fucking rodents that run at a speed faster than sound.
There is ZERO connection to what you are talking about other than paint it drawing a red beard on a Neanderthal, seriously this is straddling right along the lines of flat earth nonsense.
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No ignorance is linking a fucking article that doesn't reinforce your claims, there is no fucking connection to this made up bullshit, you drummed up because you watched too many fucking movies, seriously and no amount of copy pasta about neanderthal and genes found in modern humans is going to change that.
There is no evidence for your hypothesis, NONE, not even a little fucking bit.