I have also kept an ADF with a clown pleco. every time the frog happened to find his way into the clown plecos cave of driftwood he would be promptly scooched out by the clown pleco (clown plecos are very territorial to their piece of driftwood)
garfieldnfish is right, the
right driftwood is very important for clown plecos. clown plecos originate in south american rivers wherethey live in the rooted systems of trees. driftwood makes up a lot of their diet, they scrape away wood fiber. they are cafofllauged to blend in with the wood, and so they feel safer with some. you wont need a very big piece of the right kind of driftwood. Try to go for african hardwood, bogwood, mopani, malaysian. I've read on here people have had clown plecos with american randomly found driftwood pieces off ebay and they dont like them so much. I have a small piece of african driftwood in my tank, and he literally never goes further than 3 inches away from it.
I dont even shuck the peas, skin and all still eats them.