Can you install ceramic or porcelain tile flooring without grout

What would you use instead, or nothing? If there is no grout dirt will fall between the tiles no matter how close you lay them.

Have you considered laminate flooring? They fit together without a glue.

Yes, but you will have spaces between the tiles that will be uneven, collect dirt, and be a trip hazard. I think they make special tiles that lock and don't need grout...check with a company that specializes in doing floors

How would they stay in place other than the mortar? What about all the nooks and crannies to clean? I would not recommend it.

You can, but it's not ideal, especially for cleanliness.

Grout is used to go between the tiles for a smoother look and to help hold the tiles in place.

Not a good idea they would most likely crack. Check out interlocking tiles.

You definitely need grout. It holds the tiles together and creates a smooth surface,