I would agree that there is a considerable similarity between the Laguiole and some of the Toothpicks, certainly in the blades and even in the handles on some. But the Toothpicks did not traditionally come with any form of a lock on the blade while a Laguiole did, the bee at the juncture of the blade and the handle, at the back, lifts up and clips over a pin on the blade in the same manner as the old Italian Stiletto switchblades did.
The Texas Toothpick has been thought, by many, to have been the knife that was the "flashing blade" in the song, "Everglades", made popular by the Kingston Trio back in the late 1950s
EVERGLADES
Harlan Howard
He was born and raised around Jacksonville.
A nice young man, not the kind to kill.
But a jealous fight and a flashing blade
sent him on the run to the Everglades.
Runnin' like a dog through the Everglades.
Now, the posse went in and they came back out.
They said he'll die and there ain't no doubt.
It's an eye for an eye so the debt is paid.
He won't last long in the Everglades.
A man can't live in the Everglades.
Chorus:
Where a man can hide and never be found
and have no fear of the bayin' hounds.
But he better keep movin' and don't stand still.
If the 'skeeters don't get then the 'gaters will.
Runnin' like a dog through the Everglades.
(Last time - Skippin' like a frog through the slimy bog. Runnin' through the trees from the Everlys.*)
Now, the years went by and his girl was wed.
His fam'ly gave him up for dead.
But now and then the natives would say
they'd seen him runnin' through the Everglades.
Now, he never heard the news on the radio.
He was deep in the 'glades so he'll never know.
His runnin' and hidin' didn't make much sense
for the jury had ruled it was self-defense.
Running like a dog through the Everglades.
(Chorus)
* I don't know but, presumably, "Everlys" refers to the Everly Brothers, a very popular singing duet at the time that the song was recorded. They were very early "Rockabilly" performers along with Elvis Presley and Buddy Holly, the base that became "Rock & Roll". This note is my addition, Hugh.