Ahh kk, thanks Hix - the entrance to this exhibit had all the ID boards flashing on a single screen and we saw one for the puffer, which I thought was this fish as it looked puffer-ish shaped and had similar markings from what I remember [only got a quick glimpse of the ID, and fish isn't my strongest point]
Puffers and Tobys belong to the same family, Toby's are much smaller though. This is a photo of a Guineafowl Puffer adult, juveniles look pretty similar just smaller.