Go to the settings and turn on safe search. I find better results using Google than in using these sites which offer a "safe search". Google seems to have fewer ads than they do. You might want to a look at the digital resources which Google offers to families.
Kiddle is a Google search engine for kids. It seems to be free of pornography, but there are, of course, Google ads at the top of the results list. The results page has illustrations, and it is possible to search for images, videos, and news. Kiddle uses Google safe search but is not affliated with Google. It is possible to search in Spanish. It has a nice clean look and it gets my vote for the best search engine to use with kids.
Duck Duck go is a combination search engine and browser. Duck Duck Go says that it will remove trackers following your movement on the web. Duck Duck Go has a safe search setting.
This an extensive list of search engines by Wikipedia. It will keep you busy for a long time.
Artificial Intelligence Search Engines
They are out there and it is best that we become familiar with them and decide if that is what we want to use for students.
Gemini - This is Google's artificial intelligence search engine. For information about Gemini and its use go to here
Copilot - This is the AI which is associated with Bing. It has assistants for graphics, fitness, and cooking and vacations.
Ad Blockers
I am appalled by the number of ads which appear on web sites for children. I am posting some information on ad blockers here, and you are on your own in trying them out.
An extensive site with information for children, parents and teachers. The information provided deals with all forms of the
media. By the Canadian Centre for Digital and Media Literacy