Can I use tongue 'n groove pine as ship lap for my kitchen backsplash?

Hi Darlene, You sure can! Here's a link that you may find interesting! http://myfabulesslife.com/how-to-install-wood-plank-backsplash/

Have fun!

YES

Sure, why not? I think it would look nice.

Yes but use a good scrubbable paint so you can wipe off any splashes and grease. I'd use a good semi-gloss.

Yes! But make sure you protect the wood properly, especially if its in a place in the kitchen that can get very dirty very often.

Also I wouldn't recommend placing it next to the stove top - (a) fire hazard (b) this area tends to get dirty quite a lot

Well tongue and groove is tongue and groove and not ship lap. The boards are narrower.

sounds good, just make sure you coat it with a wipable urethane