Larva
egg
Taenia solium Adult worms live in human small intestine causing taeniasis. The larval stage (Cysticercus cellulose) lives in pig or human tissues causing human cysticercosis. I'd say the small intestine. But, that's just from a quick google, I didn't look much.
No reptiles do not have a larval stage.
egg
CATERPILLAR
no
Yes they do.
planula
No, platyhelminthes do not have a trochophore larval stage. Trochophore larvae are typically characteristic of marine annelids and mollusks. Platyhelminthes have a diverse range of reproductive strategies, but they do not generally exhibit a trochophore larval stage in their life cycle.
a grub
It grows the most at its larval stage (caterpillar)