If it is a Qualcomm variant for the US, nope. Samsung does not allow bootloader unlocking on those anymore. I think some enterprising people have found unpatched exploits that have allowed some models to be unlocked and rooted. But it is sadly not a common thing with those anymore.

The Pixel is the most friendly to the custom rom scene these days. Although with the recent changes to purging the device tree's from upstream AOSP, I've read that Google is starting to make it much harder to use as a practical feature on the Pixels as well.