A. Aquiel Uhnari
B. Bun, Janeway wore her hair in one.
D. Distress (The crew of the Enterprise was in this state)
E. Exothermic Reaction
F. Faaaaaaaaaaaaaaake!!, it's a
H. Harry Mudd
I. Iotians - from the TOS episode "A Piece of the Action". The Iotians inhabit the planet Sigma Iotia II.
J. J25, System. As featured in "Q Who"
L. Lizard (Charlie X turned that girl into one)
M. Minsharra Class Planet
O. Odan (the Trill on TNG
P. Peter Preston (i should get double score
Q. Quantum Slipstream Drive
S. Samuel Clemens