M3, Hiro, D3 can stick out their tongue, although not well.  Can M4 do it?

Of course.

Tongue morphs are under Morphs | Expressions | Base in M4's head. They're part of the basic package.

Or you could check this out by myself. LOL

http://www.renderosity.com/mod/bcs/sexy-tongue-ii-for-m4-stand-alone-version/67894

Something seems to be missing.  The only tongue morphs available are:

Tongueasideside

ToungueUpDown

TonguebaseupDown

TongueTipUpDown

TongueLength

TongueWidth

TngueThickness

None of them make the tongue stick out of the mouth. 

BTW, I'd love to purchase that product but don't have the money.

Using tonguelength the tongue base moves and the tongue gets longer, and then can be pulled back into the mouth with translate.  It bends the tongue in weird ways, but I think it can work with some practice. 

Fibbits,

You've encountered the reason I did the product. LOL

I will vouch for kyhighlander59's tongue. I bought the one for Laura, very nice product.

I think the product is great.  But buying a $9 item here, and there, and everywhere adds up.  It's too much for the budget.

I was able to do a nice job with M3, Hiro and D3 with magnets. 

But M4 doesn't seem to have a dial for sticking out the tongue.  Tongue length at least gives me something with which to work.

You may also be able to play with the scale dials for the tongue parts. Use an unhide script from freestuff if the dials are not visible.

Ah yes, the old unhide.

I was able to do a decent job with the translate tool and increasing length.