If you hand it to him then he'll usually take it, but getting it into his mouth by himself poses problems. He may or may not get it out of his fist and into his mouth, so he'll either chew nothing thinking it's in there or lick his fist.
In his bath, he enjoys three ducks of varying sizes, a rattle and a scoop. The smallest duck goes immediately in his mouth while he manages the rest by alternately pulling them to his chest or dropping them over the side.