So as of right now you cant outright put ambergris into a babys inventory but right b4 they run out of food you should be able to feed them. Pig method is only necessary if they dont eat right b4 they run out
I’ve found the eggs. The eggs are located inside the volcano in an amethyst cave. There are lava pools with groups of magmasaurs in them. There are small islands with craters in them, within those craters the eggs are nestled within. But be careful there are lots of magmasaurs, magma, and what look like varient rock elementals.