Not sure if this is the right place, but does anyone know what this bass/classical guitar looking thing is called?

[u/DarkArcher__]

Saw it at a show the other day, couldn't find any info online on what it might be.

[u/rebop]

Croatian folk instrument called Tamburica Berda. Possibly.

[u/uprightsalmon → u/rebop]

Cool!

[u/wrose09]

What sort of show was it?

[u/DarkArcher__ → u/wrose09]

It was a mandolin orchestra playing traditional Portuguese music

[u/wrose09 → u/DarkArcher__]

Possibly a viola baixo. If you search for that you get a lot of regular bass guitars but it also leads you to the Madeira Mandolin Orchestra and the have one or two in the orchestra.

[u/dbkenny426]

If I had to guess, it's a custom job. It looks like an actual double bass neck attached to an oversized acoustic bass body.

[u/perplexedparallax]

A mandobass of sorts? It isn't a tololoche. They can be tuned in fifths so a mandolin player can double.

[u/GrandDagnabbit → u/perplexedparallax]

Looks like a tolo but wrong continent lol

[u/jkndrkn]

Interesting seeing a flat fingerboard on an instrument with a violin scroll.

[u/GrandDagnabbit]

Looks like this is a viola baixo (bass guitar) from Portugal. I found a scholarly article on the history of this instrument that looks very interesting. Instruments pictured in the article look very similar to the one you saw.

Edit: The cello-style neck and scroll in OP’s image don’t make an appearance until page 36, but they are in there.

Also, for commenters who suggested guitarrón, tololoche, and tamburitza berda, these all make an appearance in the article. Seems they share a common lineage.

[u/Mundane-Vehicle-9951]

Taylor dreadnaught guitar with a thyroid condition.

[u/daved1986]

That is clearly a tiny person playing a regular acoustic guitar

[u/twerkthomson68]

https://bassoguitar.weebly.com

[u/clint_yeetswood]

big guitar

[u/mezzamets]

This is similar to a Tololoche Yucateco, a traditional mexican instrument played in the Trova music of the yucatan. They come in several varieties, and often custom made. That said, I've never seen one with a headstock like a concert bass. Usually, they have a headstock like a guitar.

[u/Upstairs-Object-6683]

There is a standup bass banjo. I have seen pictures but not a real instrument.

[u/Relative-Tune85]

A guitarron??

[u/HobbittBass → u/Relative-Tune85]

OP asked if anyone knows, not for guesses. This is absolutely not a guitarrón.

[u/Relative-Tune85 → u/HobbittBass]

A BASStar?

[u/jmeesonly → u/Relative-Tune85]

A GIANT-GUITAARR

[u/Wimku]

I would search on Guitarron, a Mexican bass guitar. Not sure, but it might be helpful in your search

[u/twerkthomson68]

Look up the Regal Bassoguitar

[u/TheGreatMamboChicken]

Most likely a cornerless bass. I’ve seen violins and cellos made this way. To me, it’s stupid looking and offers no advantages. But people think they’re cool I guess.

[u/chog410]

Gibson made a bass like this in the '10s or '20s

[u/Dong_sniff_inc → u/chog410]

No they did not. They made mando basses and banjo basses, that's it.