All of those sound effects are too difficult to translate! I think that they are all:
Peta-peta- sound of walking
Pyon-pyon- sound of hopping
Nigi-nigi- sound of grabbing (like a baby does)
Bun-bun- sound of shaking or swishing
Paku-paku- sound of taking big bites
Chuggyu -(edit) someone suggested this may be mixing "chu" (kiss noise) with gyu (grab noise). hmm?
Fuku-fuku- sound of sniffing
Waku-waku- sound of excitement
That's what I came up with using four dictionaries and the internet. But maybe someone else knows more what they mean?
Also, would it be best to leave them in Japanese with an explanation of meaning or to try to find English equivalents (onomatopoeias?). Does anyone know a good site for English sound effects as well? Or, if you know English sound effects well, please help me and I will appreciate you forever!