A new study provides a useful survey of ancient and early modern discoveries of large bones which were misinterpreted as the remains of giants. (They usually, in fact, belonged to mammoths and whales.)
Marco Romano and Marco Avanzini, “The skeletons of Cyclops and Lestrigons: misinterpretation of Quaternary vertebrates as remains of the mythological giants” Historical Biology (June 2017): 1-24.
The article provides a host of examples. But the short section on biblical giants on pp. 3-4 contains many errors: a quotation from Genesis 6.4 is wrongly cited “Genesis 6.3”. The term “nephilion” should be Heb. “nephilim” or Ar. “Nephilin”. The Anakim are wrongly identified as Amorites in Numbers 13, which is rather the result of a conflation with the differing account in Deuteronomy 1. It has “cube” instead of “cubit”. It confusingly alternates between arabic and roman numerals for the same biblical citations (e.g. “Deuteronomy 2, 10-11”, but “Deuteronomy II, 10”). The phrase “one the vanquished kings” should be “one of the vanquished kings”. It has Italian “Giosuè” for “Joshua”. The citation “Number XXI, 33” should be “Number[s] [XXII], 33”.
Note also earlier studies on this subject by folklorist Adrienne Mayor and biblical scholar Brian Doak.