Potatoes and yams are “tubers.” They are not “YouTubers,” but there are jokes.
     
“What do you call a potato that makes videos? A YouTUBER” was posted on Twitter by Anjali. on June 11, 2014. “What do you call a potato who puts videos online? A Youtuber” was posted on Reddit—Jokes on February 17, 2016. “What do you call a potato that uploads videos? A you-tuber” was posted on Reddit—Jokes on September 14, 2018. “What do you call a potato that uploads videos? YouTuber” was posted on Reddit—Dadjokes on February 24, 2021.
     
“What do you call a yam lover that makes vlogs? A YouTuber” was posted on Twitter by Firegirl~Amaratomi on January 25, 2021.
   
 
Wikipedia: Tuber
Tubers are enlarged structures in some plant species used as storage organs for nutrients. They are used for the plant’s perennation (survival of the winter or dry months), to provide energy and nutrients for regrowth during the next growing season, and as a means of asexual reproduction. Stem tubers form thickened rhizomes (underground stems) or stolons (horizontal connections between organisms). Common plant species with stem tubers include the potato and yam.
 
Wikipedia: YouTube
YouTube is an American online video-sharing platform headquartered in San Bruno, California.
 
Twitter
Anjali.
@Anjalaaay
What do you call a potato that makes videos? A YouTUBER HAHAHAHAHAHAHAHAHA get your shit together, Anjali.
1:40 PM · Jun 11, 2014·Twitter for BlackBerry® 
     
Twitter
Salle Pierre Lamy
@sallepierrelamy
@TheQuinnspiracy ¿What do you call a potato that puts videos on the internet?
¡You Tuber!
3:02 AM · Nov 19, 2014·Twitter Web Client
 
Reddit—Jokes 
Posted by u/hayo_dayo February 17, 2016
What do you call a potato who puts videos online?
A Youtuber
   
Twitter
Ryan
@rwb76
What do you call a potato that stars in a viral video?
YouTuber.
3:06 PM · Feb 18, 2016·Facebook
     
Reddit—Dadjokes
Posted by u/mrboston9 July 24, 2016
What do you call a potato that sits around the house watching videos online all day?
A You-tuber.
 
Twitter
Chris Young
@worldofchris
What do you call a potato that makes online videos?  A #YouTuber.  You’re welcome.  #DadJokes
@youtube
1:34 PM · Mar 31, 2018·Twitter for iPhone
   
Twitter
Desmond
@desmondbullen
What do you call a potato who posts videos on social media?
A YouTuber.
11:05 AM · Jul 28, 2018·Twitter Web Client
     
Reddit—Jokes
Posted by u/Gadetron September 14, 2018
What do you call a potato that uploads videos?
A you-tuber.
 
Reddit—Jokes
Posted by u/JeezFine November 29, 2018
What do you call a potato that makes internet videos?
A YouTuber.
 
Reddit—Dadjokes 
Posted by u/Laymans_Terms19 February 16, 2019
What do you call a potato that makes internet videos?
A You-tuber
             
Twitter
nickbot
@nickmccarthybot
what do you call a potato that is filming a music video?
1:14 AM · Apr 29, 2019·Cheap Bots, Done Quick!
 
Twitter
Scott Webb
@voxsouley
Q: What do you call a potato that posts videos on the internet…?
A: A you tuber. #dadjokes #potatojokes
12:11 AM · Jun 6, 2019·Twitter for iPhone
 
Reddit—Jokes
Posted by u/Ratbu September 10, 2020
What do you call a potato who posts videos online?
A You-tuber
 
Twitter
Melayna Moore
@moore_melayna
What do you call a potato that makes internet videos?
A youTUBER
GIF
11:21 PM · Nov 16, 2020·Twitter for iPhone
   
Twitter
Firegirl~Amaratomi
@amaratomi
What do you call a yam lover that makes vlogs?
A YouTuber
Quote Tweet
Firegirl~Amaratomi
@amaratomi
· Jan 25
I have a joke
6:15 AM · Jan 25, 2021·Twitter for Android
 
Reddit—Dadjokes
Posted by u/sitathon February 24, 2021
What do you call a potato that uploads videos?
YouTuber