The Teletubbies are a British children’s television show. My favourite show ever from my babyhood. Though my sister born two years after me got creeped out as soon as the sun rose.
Laa-Laa: This could be a nickname for Lara, Lauren, Laura and Aaliyah and many more. I don’t recommend it as a first name as that would just be cruel. another spelling could be La-La, Lala or Laalaa.
Po: I really like this as a nickname as it is really cute a spunky. It could be a short form for: Poppy, Poet, Poem, Poetry, Posey maybe even Penelope (shortens to Poppy which could be shortened to Po). Another spelling is Poe which is an Italian River.
Tinky Winky: I have no idea what this could be short for
Dipsy: No idea again.