Kardashian Fam -- We're Gonna Git You, Sucka

Kris Jenner is on the hunt to find the lying scumbag who called in a FALSE report to authorities that her kids, Kendall and Kylie Jenner, are living in danger ... TMZ has learned.

As we previously reported, the L.A. County Department of Children and Family Services launched an investigation into the K-family last week after receiving a tip from an anonymous caller.

The tip was determined to be bogus ... and we're told Kris believes the culprit is a tabloid reporter who was trying to make up a story.

Now, a rep for the Kardashian family tells TMZ the accusations are nothing short of "ridiculous" ... adding, "It's such a shame that anyone can make up such hurtful and hideous untruths especially when children are involved."