Feeding question

For those of you who are lucky enough to own dog faced puffers I have a question for you. I have a stars n stripes (about 2 inches) and I've had him for a couple of months now and he is doing great eating etc. The other night I had peas with my dinner and decided to pop one in the tank. The stars n stripes loved it. Is this ok to feed to them. The peas are frozen and the way i prepare them is just to steam them on the stove using a pot, water and one of those metal steam things that goes in the pot. Anyway, the peas are like candy to him he loves them. I have only fed it to him on two separate occassions. Any insight would be greatly appreciated.