liste a nickname of each member in b1a4

Baro - Squirrel
CNU - Bear
Gongchan - Crong (T/N: crocodile character from Pororo the Little Penguin)
JInyoung - Arctic renard / mirror prince
Sandeul - Duck

source;
Baro, CNU, écureuil - Sesame Player, B1A4 Hello Baby, etc.
Gongchan, Jinyoung - link

baro- princess écureuil (sesame player)
gongchan - turchan (gurupopop)
jinyoung- grandpa (match up, sesame player baro calls him ahjussi)
sandeul - canard (sesame player)
CNU- pooh