A recent poll indicates that Maryland Lt. Gov. Joseph Curran has slipped slightly but still leads the race for state attorney general, while a whopping 46 percent of the electorate remains undecided.

The poll of 529 registered Democrats, published last week in the Daily Record, a Baltimore newspaper, showed Curran leading with 24 percent, down from 28 percent in December.

He was followed in the latest poll by former attorney general Francis (Bill) Burch with 12 percent, former U.S. attorney Russell Baker with 11 percent and Deputy Attorney General Eleanor Carey with 6 percent.

About 46 percent had not decided who they would vote for in the Sept. 9 Democratic primary. Two Groups Endorse Sachs

Two environmental groups said this week that they are endorsing Attorney General Stephen Sachs's candidacy for governor.

The Maryland League of Conservation Voters and the state chapter of the Sierra Club said Sachs represents Marylanders concerned about public health and natural resources better than Baltimore Mayor William Donald Schaefer, who is expected to join the Democratic race shortly.

The two environmental groups said the creation of the Hazardous Waste Strike Force, which has conducted more than 85 investigations and obtained criminal charges in 40 cases, is Sachs's most notable accomplishment. Announcements Bethesda attorney Brian Frosh, 39, said Sunday that he is entering the race for Democratic nomination for the Maryland House of Delegates in the 16th Legislative District of Bethesda. The son of Circuit Court Judge Stanley Frosh, he was the Democratic Party's nominee in 1982 for the state Senate seat in the 16th District. He was defeated by incumbent Howard Denis.

Michael Twigg of Seabrook, president of the Prince George's Young Republicans, is running in the 23d District for the GOP nomination to the House of Delegates.

Twigg, vice president and regional manager of a subsidiary of the National Housing Partnership, is also first vice chairman of the Maryland Federation of Young Republicans.

Myriam Marquez Bailey, 39, a senior attorney for the Montgomery County Council, is running for the House of Delegates from District 14A in eastern Montgomery. A clinical law professor at Georgetown University Law Center, she is responsible for management of the county's Office of Legislative Counsel and previously was legislative counsel for the General Assembly.

Wilbert R. Wilson, 41, of Mitchellville, executive director of the Metropolitan Minority Trade Association, said Sunday that he plans to run for the 6th District seat on the Prince George's County Council.

An assistant to former County Executive Larry Hogan, Wilson has taught psychology and drug education at Prince George's Community College and Bowie State College and sixth grade in the county schools.

DeVance Walker Jr., 39, announced last Friday that he's running for the House of Delegates from District 20, which encompasses Takoma Park and Colesville. A resident of Silver Spring, he is a minority affairs assistant to Montgomery County Executive Charles Gilchrist. Walker was previously a teacher in Montgomery County and an evaluation officer for the school system.

Al James Golato, 63, a past chairman of the Prince George's school board and corporate director of public affairs at H&R Block, has declared his candidacy for a seat in the House of Delegates from the 23d District, which includes Bowie and Greenbelt. The Bowie resident is chairman of the school system's ethics commission.

He recently chaired a teacher salary study committee for the county.

Maryland Republican congressional candidate Robert Neall has made public his tax returns, and is urging other candidates in the state's 4th District to do the same.

Neall, who is giving up a seat in the House of Delegates, said he disclosed his income to increase public trust. He and wife Margaret reported income of nearly $68,000 for 1985.

Democratic opponent Tom McMillen, who is retiring after a long basketball career, is the obvious target of Neall's tax disclosure. McMillen reportedly earned $248,000 last year, not including income from business investments.

McMillen's campaign manager, Jerry Grant, said the former Rhodes Scholar had not decided whether to meet Neall's challenge.