I don't think it allows you to do that. But if you want to sell other items , such as your nest items.. You can go to the Haggle Hut in Gong's Pipenest.
Paris frog or frog from/of Paris. Hmm, unusual!
cookie monster
frog snail cheese spring
you put frog snail spring sock
rock spring frog cheese
slug frog cheese spring
You mix the Frog, the Sock, the Rock, and the Cheese
rock sock frog snail
snail,cheese,frog,spring
the answer is snail,frog,spring ,rock
Frog, sock, spring, cheese Purple Blob Monster 6th monster
to make the 13th monster put the spring , rock , frog , and cheese