There aren’t ants in anchovies, but there is a popular pizza riddle:
   
Q: What does an aardvark like on its pizza?
A: Ant-chovies.
 
The joke was included in the book The Zaniest Riddle Book in the World (1984) by Joseph Rosenbloom.
 
       
Google Books
The Zaniest Riddle Book in the World
By Joseph Rosenbloom
New York, NY: Sterling Publishing Company, Inc.
1984
Pg. 5:
What does an aardvark like on its pizza?
Ant-chovies .
 
Google Books
May 1988, Boys’ Life, “Think & Grin,” pg. 66, col. 1:
Dink: what does an aardvark like on its pizza?
Duff: What, Dink?
Dink: Antchovies!
—Jeff Traynor, Montgomery, Ala.
 
Google Books
Fractions, Ratio, Probability, and Standard Measurement:
Reproducible Skill Builders and Higher Order Thinking Activities Based on NCTM Standards
By Brenda Opie, Lory Jackson and Douglas McAvinn
Nashville, TN: Incentive Publications
1995
Pg. 87:
What do aardvarks like on their pizza?
ANTCHOVIES
 
Newspapers.com
18 March 1997, Fort Worth (TX) Star-Telegram, “Humor,” Sec. F, pg. 15, col. 1:
Q: What does an aardvark like on its pizza?
A: Ant-chovies.
Jordan Lawrence, y
Bess Race Elementary
 
X/Twitter
Little Wing Pizzeria
@littlewingpizza
What does an aardvark like on its pizza?
  Ant-chovies.
4:39 AM · Nov 20, 2009
 
X/Twitter
Pizza Diary
@MyPizzaDiary
What do aardvarks like on their pizza? Ant-chovies…you can have that one.
5:16 AM · Dec 30, 2011
 
X/Twitter       
NY Pizza Delivery
@NYPDMKE
Does anyone know what Aardvarks like to eat on their pizza? (Antchovies)
10:00 PM · Mar 11, 2012
   
X/Twitter
Papa Johns Pizza St. Louis
@PapaJohns_STL
What does an aardvark like on its pizza? Ant-chovies.
1:21 PM · Sep 23, 2012
 
X/Twitter
yikes
@reid_about_k8
what do aardvarks like on their pizza?
ant-chovies
11:19 AM · Oct 27, 2012
 
Reddit—Jokes
Posted by u/frozebanana January 18, 2018
What does an Aardvark like on its pizza?
Ant-chovies.
 
X/Twitter
Village Court Apartments
@VillageCourtApt
What do aardvarks prefer on their pizza? Ant-chovies! Pick out your favorite pizza toppings and bring a pie home from Sal’s Pizzeria and Catering next time you’re not in the mood to cook. https://google.com/maps/place/Sal’s+Pizzeria+and+Catering/@40.73843,-73.0895616,15z/data=!4m15!1m9!2m8!1spizza!3m6!1spizza!2s47+Island+Blvd,+Bohemia,+NY+11716!3s0x89e8360d716eeab7:0x1353d8b127a2d25e!4m2!1d-73.1093742!2d40.7548458!3m4!1s0x89e84a07af85cf05:0x571da929f5648c74!8m2!3d40.73843!4d-73.0808069
6:51 PM · Oct 23, 2018
 
Reddit—Jokes
Posted by u/[deleted] May 19, 2019
What does the aardvark like on his pizza?
Ant-choves
 
Reddit—Dadjokes
Posted by u/rossumcapek February 13, 2020
What does an aardvark order on their pizza?
Ant-chovies.
 
X/Twitter
Funny Teacher
@SchoolJokesK_12
Hey @Petco @PetSmart What does an aardvark like on its #pizza?… Ant-chovies. https://bit.ly/34FA0mn #NationalPizzaDay #ants
6:06 AM · Feb 9, 2021