If you're allowed to smash them into dust first, you could fit 15 Titans in the volume of the Earth, as the Earth's volume is 15.13 times Titan's.
However, if they have to stay spheres, you can only fit 2 to 4, because you'll need to leave space between them. The diameter of Earth is 2.47 times the diameter of Titan, so you could definitely fit 2 side-by-side.
The circumradius of 3 Titans in a triangle is √3/3*diameter+radius, which equals 2.15 times the radius of Titan, and Earth's radius is 2.47 times Titan's, so you could fit 3 Titans in a triangular shape inside Earth.
It might be possible to fit 4 in a triangular pyramid shape, but you'll have to do the math. This topic is called "sphere packing"
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4 moons would go across the earth, and 109 earths would go across the sun.
The earth's diameter is 3.66 times that of the moon so just over three-and-a-half moons would fit across the earth,
4 moons could ft inside the Earth.
There is no moon IN the Earth. There is one moon ORBITING AROUND Earth.
i think ten