Riddle #18 Answer
Answer
1. mustards + (RATS - mu_STAR_ds)
2. frosting + (NITS - fro_STIN_g)
3. consumes + (EMUS - con_SUME_s)
4. tastable + (BATS - ta_STAB_le)

Riddle #17 Answer
11=6
12=6
The number of letters in the words: eleven, twelve

Riddle #16 Answer
Answer: 11  letters in the  phrase "The Alphabet"

Riddle #15 Answer
Answer: dozens

Riddle #14 Answer
Answer
Giant to Big to Bit to Bite to Chew to Hew to Chop.

Riddle #13 Answer
Answer: His horse is named Friday!

Riddle #12 Answer
Answer: When you add two hours to eleven o'clock, you get one o'clock.