Yep. These images circulating on the internet, well most of them anyway, originate from a photoshopping contest from the 2000's. The pictures were taken from that website, and unscrupulous individuals began sharing them, and thus an online hoax was born.
Here's a blog article from the relevant website about this.
Giant Skeletons Seem Too Real To Be A Hoax
Here's another relevant article, unfortunately since it's 11 years old the link to the original NatGeo article no longer seems to work.
National Geographic on giant human hoax
Relevant Snopes articles:
https://www.snopes.com/fact-check/giant-skeleton-uncovered-saudi-arabia/
https://www.snopes.com/fact-check/creation-schism/
So, no, no giant skeletons have ever been found, because there have never been giants. The giants of the Bible are not giants, they are regular human beings who happened to be unusually tall, such as Goliath who was remarkably tall compared to everyone else. Goliath wasn't supernaturally tall, standing at about 6'10 makes him not even as tall as a number of modern NBA players.
And, yes, I know that the Masoretic Text has Goliath taller, but the older texts (the LXX and DSS) give him a far more reasonable height, and so the much later Masoretic Text almost certainly contains an embellishment.
There's a very simple reason why there were no giants--it is physically impossible. I don't just mean biologically impossible, I mean it would defy the very laws of physics.
-CryptoLutheran