Answer:
56 Swedish Fish
Step-by-step explanation:
1 = T
2 = H
3 = U
4 = N
5 = D
6 = E
7 = R
8 = C
9 = L
10 = A
11 = P
Thunderclap means a crash of thunder
T h u n d e r = 7 letter word
Hence the number of fishes Viking gives Norman is 8 × 7 = 56 Swedish Fish