Northern Territory detectives have seized a baby crocodile and drugs during a raid on a Darwin home.

Police say they were acting on a tip-off from a media outlet about a possible child at risk when they executed a search warrant at the Fannie Bay residence.

"Detectives seized 20 grams of cannabis whilst executing the search warrant today, resulting in a 29-year-old man being summonsed to appear for cannabis offences," Detective Acting Senior Sergeant Karen Sanderson said on Tuesday.

"A baby freshwater crocodile was also seized during the execution of the warrant.

"Staff from the Parks and Wildlife Commission attended to collect the crocodile and will now investigate if any offences have taken place under the Territory Parks and Wildlife Conservation Act."

Under NT law, anyone who believes on reasonable grounds that a child has suffered or is likely to suffer harm must report their information to the Department of Children and Families or police as soon as possible.